STEP INTO DYNAMIC CAREER WITH MAGNETIC PARTICLE TESTING METHOD

The global of NDT is the very confusing place, even for the most experienced Technicians/Engineers. So many methods, certification and so much accountability and responsibility for companies and individuals alike.

Magnetic particle testing is one of the most important non-destructive testing techniques used by many industries.This testing recognizes the interior imperfections in ferromagnetic substances like cobalt, and some of their alloys, iron, and steel etc. This is only one of the little kinds of Non-destructive testing skill and is so named since the materials and products are analyzed or study without equipment casualty. From the element in bridges to high performance, magnetic particle testing is used to identify the defective parts before they are put to use. Using the wrong implementation to match the component is the main source of incorrect testing. To understand the main problems relating to magnetic particle testing may go a long way toward allowing repeat phenomenon. The only requirements are that the product inspected must be made of ferromagnetic materials. We are offering Magnetic Particle Testing NDT training courses in our center.

How does magnetic particle testing work?

The concept is literally simple. Any metal or object that is magnetized will be surrounded by an invisible magnetic field. If there is any defect – like crack, space or a hole in the metal object the defect will cause an interference in the magnetic field. Magnetic particle testing allows you to get clearly see that disruption and then identify the defect.

Which Equipment is used for Magnetic Particle Testing?

These are the types of equipment which are used for magnetic particle testing
Whether equipment for wet or dry method
Magnetization requirements (AC or DC)
Demagnetization- incorporated or separate unit
Degree of automation
Amperage required
Line voltage requirements
Air supply requirement
Accessories needed or required.

Which Industries can use magnetic particle inspection?

1.  Structural steel industry
2. Petrochemical industry
3.   Aerospace industry
4.  Power generation industry
5. Automotive industry

Certification

In order to perform NDT extensively in all industrial applications, certification is mandatory. The certification is made in line with SNT-TC-1A of ASNT which is explained in detail.
ASNT- AMERICAN SOCIETY FOR NON-DESTRUCTIVE TESTING
SNT-TC-1A- Society for Non-destructive testing(SNT)
                     Technical Council (TC)
                     First Document(1A)
The document published by ASNT provides guidelines for the establishment of qualification and certification program. This will help the candidates in qualifying, a person engaged in any of the NDT methods. This is not a strict specification. So this can be modified according to the requirements.

What are the levels of qualification

There are three levels of qualification. They are
NDT LEVEL-1
NDT LEVEL-2
NDT LEVEL-3

Target consumers

The usage of Magnetic particle testing is at some point in a manufacturing life cycle from an introductory form of the ingots to the finishing wrought or welded products after the item has been placed in service.

Customer service

The involvement of modern industry and the requirement for secure and more genuine products and equipment dictates the utilization of fabrication and testing methodology that protect maximum reliability. Magnetic particle testing can be applied properly provide:

1. Increased product usage and reliability
2. Identifying problems at the right time to improved production processes so that they can be corrected properly
3. To minimize the costs in terms of so many returned items and to make changes in that items.
4. Quality improvement

Why attend this course?

Candidates should have the opportunity to utilize a huge diversification of materials, castings, welds, and products on this academic and practical course. This course is highly suitable for beginners and also NDT experienced candidates.We are also provide excellent training and preparation for examinations.

TRENDS AND CHALLENGES FOR THE OIL AND GAS INDUSTRY

The last decade has seen tremendous advances in technology related to finding, estimating, and producing oil and gas. A decade ago, many of these technologies would have seemed like scenes from a Sci-Fi novel. But today, they are realities. They range from supercomputers to nanotechnology.

The Digital Oilfield
Imagine an oilfield where all the components integrate and communicate constantly on a platform from which companies can manage, measure, and track all of the data coming from all over the oilfield.
Instruments constantly read data from wellheads, pipelines, and mechanical systems.
Information is evaluated by computers, which send analytics to real-time operations centers that fine-tune oil flows to optimize production and reduce downtimes, cutting operating costs by up to 25 percent while improving productivity by five percent.
The investment to make this happen is occurring now. According to Oil and Gas Investor, total upstream energy IT support spending is about $0.25 per barrel of oil. Experts at Booz Allen Hamilton believe digital oilfield technologies could increase the net present value of oil and gas assets by 25 percent.
The last decade has seen tremendous advances in technology related to finding, estimating, and producing oil and gas. A decade ago, many of these technologies would have seemed like scenes from a Sci-Fi novel. But today, they are realities. They range from supercomputers to nanotechnology.

The New Normal

The days of so-called “easy” or conventional oil are dwindling; so the oil and gas industry has focused on developing technological solutions, thereby increasing the world’s producible reserves and creating the “new normal” of exploration and production. Oil companies of all sizes have used technology to find quantities of oil and natural gas so substantial that worries about running out have dissipated. Here are some of the technologies that are making that possible:
Development of the Subsea Oilfields — Subsea oil and gas technology is advancing to meet the requirements of increasingly demanding production environments: deeper water, greater distances from shore, and higher reservoir temperatures and pressures. Oil companies are cognizant of the risks and rewards. Over 100,000 people attended the Offshore Technology Conference in 2013, a multi-day conference focused on drilling rigs, remote underwater vehicles, and crew safety. At the conference this year, Dr. Phaneedra Kondapi, an adjunct professor of subsea engineering at the University of Houston, presented findings that moving fluid processing to the floor of the sea was the most sought-after technology being developed and improved today. Moving processing to the ocean floor reduces infrastructure costs and production costs, greatly improving return on investment.
The Shale Play — Exploitation of shale basins using hydraulic fracturing (“fracking”) and horizontal drilling techniques has pushed U.S. crude output to its highest level since 1989. The resurgence in production helped the U.S. meet 87 percent of its energy needs in the first five months of 2013, on pace to be the highest annual rate since 1986, according to the Energy Information Administration. These techniques have changed the risk profile of drilling for oil and gas. For example, in the Bakken there is a 99 percent success rate of finding producible oil. With this success rate, rigs are used like a sewing machine putting together a patchwork quilt, just moving from section to section drilling a well and then moving to the next patch. Large shale basins in other countries have yet to be developed. As they begin to be developed, we can expect the supply and demand curve for oil and gas to be impacted.

Enhanced Oil Recovery — Conventional production recovers approximately 35 percent of the original oil in place. The rest remains trapped in the rock. Boosting oil recovery could unlock around 300 billion barrels of oil, according to the International Energy Agency. New techniques of unlocking that trapped oil are being developed, such as steam or chemicals tailored to the properties of the rock and gas. These techniques are being used on older fields, where the exploration and drilling risks are minimal and the infrastructure to get oil and gas to market is already in place. This reduces the risk and the infrastructure cost, making it an attractive investment.
4D Seismic Technology
The expense of exploration in deeper waters and the value of residual oil in existing fields are among the drivers of seismic technology development.The size and scale of seismic surveys has increased alongside the increases in computing power during the last 25 years. 3D technology looks at oil and gas reserves as if it is a cube with height, width, and depth. 4D technology adds time as a component, which shows how a reservoir will change over time.
Workforce Challenges
The oil and gas industry is facing a shrinking talent pool for those with specialized expertise. A large percentage of the individuals who have the institutional and technological “know-how” of their organization’s specific risks and operations are looking toward retirement. Nearly 90 percent of senior human resources executives at 22 top international oil and gas companies believe this problem is one of the top business issues facing their companies1. The chart on the following page illustrates the average years of industry experience by discipline area.
As such, many oil and gas companies are undertaking strategic initiatives to attract a new generation of workers, including increasing salaries, offering attractive perks, and aggressively recruiting and training. The companies are eager to identify key university programs, offer scholarships and sponsorships for top students and their respective universities, and actively participate in conferences and training workshops.
Salary and Wage Increases
As the global energy demand has steadily increased, the competition for talent among top energy companies has also increased. As a result, employees’ salary packages for skilled labor have seen an upward trend over the last several years, a trend that is expected to continue in the foreseeable future. According to a recent survey of oil and gas personnel performed by Hays, Plc., approximately 65 percent of the respondents experienced annual salary increases with over 50 percent of the increases being in excess of five percent. Going forward, the number of employees receiving salary increases per year between five percent and 10 percent is expected to increase approximately 30 percent, while the number of employees receiving salary increases of more than 10 percent is expected to increase approximately 28 percent.
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NON – DESTRUCTIVE TESTING EQUIPMENT MARKET IN A STEADY GROWTH

The nondestructive testing (NDT) equipment market in India is having a steady growth , according to the latest analysis by Frost & Sullivan. By the demand of end-user industries, such as automotive, aerospace,transportation, military and defense, will be the main factors of market revenues as rapid industrialization in the country makes NDT equipments indispensable. Further, developments in the infrastructure of road and the building of oil reservoirs, pipelines, refineries and nuclear power plants, offers huge opportunities for NDT equipment vendors, the analysis states.

The establishment of safety norms, quality assurance,precautionary measures, and regulations by the government boosts the NDT market segment as it is critical for establishments to provide safety assurance and procure trouble-free license approvals.In particular NDT equipment for inspection in the nuclear industry, is expected to gain a strong foothold during the forecast period.

Further, regular assessment strategies enforced to maintain ageing infrastructure and improve cost-effectiveness by optimizing its useful life supports the use of NDT equipment. For instance use of NDT helps to reduce investment in new resource procurements by testing old, navy ships,high-pressure vessels, aircraft and railway coaches for refurbished use.

"Over the last decade ,India has become a hub for third-party inspection services .More than 700 companies are offering inspection services across product segments encouraging demand for new equipment as the inspection services market grows", said Frost & Sullivan analyst.

However, price remains as a concern. The unpredictability change of the Indian currency and its momentous devaluation has lead to significant price differences between currency value at the time of placing raw material import purchase orders and final delivery, thereby decreasing manufacturers' margins. Till the situation get stabilized , new procurement s are being postponed and adding to NDT equipment suppliers' woes. In addition to price consciousness, customer reluctance to use new technologies too shrinks sales volumes.

Raising understanding on the advantages of NDT equipment among end-user industries, government organizations, and training institutes can bridge the gap between vendors and customers in the Indian market, the analysis states. Mitigating redundant technological features in NDT equipment through customized value addition and also improving automation and ease of use will widen the potential of market. Collective efforts are also required to deliver comprehensive turnkey testing solutions with benefits spread across the value chain, the analysis states. NDT Institute in kerala

THE ROLE OF INDUSTRIAL ROBOTS IN NDT APPLICATIONS

    Manufactures from different domains ranging from industrial to aerospace are preferring Nondestructive testing for quality control technique.

With automated NDT,robots and scanners are used to increase the speed and repeatability factor of NDT techniques, creating much more efficiently produced precision measurements.Automated NDT scanner requirements are needed to achieve high quality control and precision measurements.

Recently many manufacturers of industrial robots have produced robotic manipulators with excellent positional accuracy and repeatability. An industrial robot is defined as an automatically controlled, re-programmable, multipurpose manipulator, programmable in three or more axes.In the spectrum of robot manipulators, some modern robots have appropriate attributes to develop automated NDT systems and subsist with the challenging situations seen in the aerospace industry.

ARTICULATED ARM ROBOTS

Industrial robotic arms present precise articulated mechanical links whose functions are alike to a human arm.Their links are jointed to provide rotational motions and handle objects within a certain volume. Off the shelf industrial robots are recognized as a polyvalent and robust solution for many applications: welding, material handling,palletzing , laser cutting,machine tending, machining, etc.

Comparing to typical Cartesian gantry systems, the concept of an articulated arm provides a system with greater ability. Such robots can help advanced NDT methods if they meet the basic standards of automated NDT testing: data acquisition, repeatability, precision and accuracy.

MOTION CONTROL

The major difficulty of using robotic arms for automated NDT is the proprietary motion controller design that these robot use. With such control, we are rigidly fixed into proprietary programs and limited motion control capabilities. More notably, we have limited control and not enough information of the robot positions when it moves from one point to another. Automated NDT systems require acquiring data on the fly while the robotic arm is moving. So, the motion control system needs to handle extremely fast control changes (fast PID controller loops). For example, in applications that require the robot to move fast and perform contour following motions around a complex surface, smooth and precise trajectories must be maintained during the robot movement. When the PID loops close at a slow pace, the robot will not move on required precise trajectories. This may results in a jumpy motion of the robot and losses of the NDT signal measurements. Current industrial robots offer slow PID control loops, estimated around 10 times less than the required speed to perform fast and accurate NDT scanning of complex parts.

DATA ACQUISITION

Required data acquisition speed is another challenging factor of using industrial robots for NDT application.Capturing NDT data in real time while using a robotic arm is challenging feat because it requires real-time robot position monitoring.That means a direct encoder feedback has to be made available on the robot,which is generally not the case.After being processed by the motion controller unit,all these standard robot controllers will provide low rate of position feedback at around 200 Hz. The rate at which position feedback refreshes itself has a proportional impact on the inspection speed, as the robots “true” position must be attached to each measurement point and no interpolation is allowed.

By working on the main challenges identified above, industrial robots can be replaced eventually by the conventional Cartesian scanners in selected NDT application if motion control functions and encoder feedback monitoring are customized.But at this moment without such refinement in terms of the support data transfer, link and communication protocols, an efficient use of articulated robotic arms for NDT is still a work in progress.

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MICROWAVE WELDING

In the field of joining of metals research are taking place for innovative ideas to come. One such new idea is microwave joining. It is one of the newly developing and advanced technique. But the thing is most people are unfamiliar with this type of process. It is a kind of fusion welding using frequency of 2.54 GHz. Microwave technique uses microwave energy which interacts with the material at the joint interface. It can be transmitted, reflected or absorbed when interact with materials. For processing materials like glazing of sprayed ceramic composite surfaces microwave energy can be used.

Microwave energy is widely used in composite and ceramics because of its nature. The nature of composite and ceramics is that they absorb microwave. As metals tend to reflect microwave radiations less work is done in the field of metals. This method was experimented on mild steel and stainless steel as substrates. For joining butt joint is preferred as it is easy to handle. Substrates are surrounded by refractory brick after applying the interfacing material between the faces. When microwave comes in contact with charcoal, which is used to provide extra heating, it starts burning thus increasing the temperature at the joint. The faces of substrates get totally wet. The molten region coverts into a shape of joint after cooling at atmospheric situation.

Taguchi method was developed by Dr. Genichi Taguchi to improve the quality of manufacturing goods. It is also applied in engineering field. The quality engineering set by Dr. Taguchi in 20^th century was regarded as greatest achievement in engineering. In his concept he mainly focuses on engineering strategies which includes upstream and shop-floor quality engineering. In upstream method small-scale experiments and robust designs for large scale production is used while cost based real time system is used in shop floor technique. Three concepts where there in Taguchi’s philosophy. One was that quality should be planned into the manufactured goods. Best worth is achieved by reducing the deviation on or after the target. This was his second. The expenditure of quality should be calculated as a function of deviation from the standard and the losses should be measured system-wide was his third.

After doing the Taguchi’s method using L9 orthogonal array some results were obtained. The value of hardness is lower at 600 sec as the material doesn’t fuse properly than 700s and 800s. There is decrease in hardness due to excessive heat at 800s. The percentage of interfacing powder will result in proper fusion and less porosity will be observed. Since the hardness of the stainless steel base metal is higher than mild steel base metal the SS-SS joint has higher hardness. Among the three parameters, substrates has the major influence on the hardness followed by percentage Ni based powder used and time. Like that new technologies and ideas are coming in the field of welding and inspection. welding inspector course in kochi

SURFACE MODIFICATION OF MARTENSITIC STAINLESS STEEL

    It is a common practice in various engineering applications to modify the surface properties of material requiring specific surface characteristics of any component over that of its core material to suit various service conditions. It is most commonly achieved by modification of physical, chemical, mechanical and metallurgical characteristics of the surface of a metal. There are many sophisticated treatment like sputtering and treating by plasma, laser, ion and electron beam but surface modification is commonly carried out by mechanical treatment, heat treatment and fusion of the substrate as well as extra deposition on it. From the experiments done it is derived that surface fusion by gas tungsten arcing can be precisely applied for appreciable surface modification up to significant depth of a metal substrate. One effective method to achieve desired micro structural transformation is gas tungsten pulse arcing (GTPA). The precisely controlled thermal distribution in the arcing system makes it suitable for this process.

   
     GTPA due to its high peak current compared to GTA can be operated at higher energy input. But due to lower mean current, net heating of the base material remains lower. Thus by using GTPA better heat control along with wider fusion zone and larger depth of penetration is achieved. The GTPA has the ability to control energy input as well as its distribution in the entire process of surface modification of the substrate by fusion. It is achieved by manipulation of the solidification behavior and nature of phase transformation in the matrix through a control over the depth of fusion.

    The surface modification process on annealed 5mm thick stainless steel gave some results. It was carried out with the help of a Fronius Magic wave 1700 pulsed TIG welding machine. The characteristics of ripple in fusion zone were examined for different f and ᶲ values. It was observed that more number of ripples are formed per unit length with the increase of either f or ᶲ. This has resulted in relatively finer surface ripples at higher f and ᶲ. The cooling rate and solidification behavior of fusion zone have been analyzed. It has been observed that there is significant increase in cooling rate as well as primary solid growth rate for both cases that is increasing ᶲ and maintaining f constant and increasing f and maintaining ᶲ constant. Comparatively larger time for heat dissipation in between pulsed arcing at low frequency is reason for the relatively low cooling rate at lower f. it reduced the temperature gradient of fusion zone to its relatively large area of hot surrounding heat sink. A relative lowering of fusion zone width with decrease of ᶲ from 0.3 to 0.25 may have happened due to some predominant compromising effect of ᶲ in reduction of heat buildup in fusion over the effect of f on enhancement of the same up to certain extent. The controlled fusion by gas tungsten pulsed arcing and its consequent thermal behavior has significant effect on the microstructure of fusion zone and heat affected zone. The change in cooling characteristics of the matrix during solidification of the fusion zone is the reason for hardness increase. Welding inspector courses in Ernakulam

WELDING OF ULTRAHIGH STRENGTH STEEL

Structural steels with very high strength levels capable of developing minimum yield strength of nearly 1400 MPa is called ultrahigh strength steels. In recent times, the ultrahigh strength steels are in a great demand for critical structural aircraft and aerospace application. In aircrafts, automobiles, power plants, chemical industries etc. for technical as well as economic reasons the dissimilar combination of steels are necessary. Maraging steel and medium alloy medium carbon steel are used in these situations. Maraging steels are a class of precipitation hard enable martensitic steels. It develop strength due to the precipitation of inter metallic compounds.

Fabrication process which is widely employed for ultrahigh strength steels is fusion welding. Gas tungsten arc welding and electron beam welding are the two fusion welding employed. Three types of filler materials are used which include maraging steels filler, austenitic stainless steel filler and medium alloy medium carbon steel filler. The austenite get transformed to martensite during cooling in the fusion zone in maraging steels welds. In medium alloy steel weld the columnar grain growth is prevalent at the center. After post weld aging no variation is observed in microstructure as compared to as welded condition in respect of austenite stainless steel and medium alloy medium carbon steel filler welds.

The hardness survey was done on different filler welds. Austenite stainless steel weld metal shows the lowest hardness. The region of weld of medium alloy medium carbon steel filler shows the highest hardness. The hardness of maraging steel filler weld is as likely as parent metal. The residual stress at the center of the weld metal zone is compressive in case of maraging steel and medium alloy medium carbon steel weld metals. When it comes to the case of austenite weld the residual stress at the center of the weld metal zone is tensile. welding inspection courses in Kochi.

The similar metal welds will show symmetrical fusion zone and heat affected zones, whereas the dissimilar metal welds shows un symmetrical fusion zone and heat affected zones. The difference in the thermal conductivity of materials is the reason for the unsymmetrical nature. In medium alloy medium carbon steel the width of heat affected zone is more when compared to maraging steel. The residual stress in similar metal weld of maraging steel is compressive and in similar metal weld of medium alloy medium carbon steel it is tensile. In case of dissimilar metal weld it is compressive in maraging steel and tensile in medium alloy medium carbon steel.