Success tips for Successful NDT career

The success of any Nondestructive testing(NDT) methods and procedures depends upon the knowledge, skill, and experience of the NDT personnel involved in the profession. The person(s) responsible for detection, interpretation and Evaluation of indications, such as Ultrasonic testing, Radiographic testing, or Magnetic particle testing, must be qualified and certified to specific industry or other acceptable government or industry standards such as American Society for Non destructive Testing(ASNT) Personnel Qualification and Certification as per SNT-TC-1A or Indian Society for Nondestructive testing(ISNT) for different levels like Level I (1), II (2), III (3)or any other Internationally recognized personnel qualification training and certification. The person should be familiar with the respective NDT inspection test method/s, know the potential types of discontinuities peculiar to the material, and be familiar with their effect on the structural integrity of the part.

Inspection personnel should know where discontinuities occur or can be expected to exist and what effect they can have on the service life of the component or assembly. Misinterpretation and/or improper evaluation of discontinuities or improper performance of inspection tests can result in serviceable parts being rejected and defective parts being accepted. NDT personnel should be familiar with the detection of discontinuities such as: corrosion, inherent discontinuities, primary processing discontinuities, secondary processing or finishing, in-service discontinuities and codes, standards, specifications pertaining to the NDT.

It is with the interest in learning the skills and practicing, one can become a more professional NDT inspector/technician. More than just having the knowledge got in the training courses, it is important to learn the things with patience during NDT inspection and regularly practice the inspection/test methods to understand and develop the skills independently for a successful NDT career.

Nondestuctive testing-NDT courses in Bangalore,India

Trinity Institute of NDT technology, India announces NDT refreshment courses schedule for Level I(I), Level II(2)from 19th of February 2010 for the following courses

1. Ultrasonic testing
2. Radiography
3. Liquid penetrant testing
4. Magnetic particle testing
5. Visual testing
6. ultrasonic thickness gauging

All the above nondestructive testing-NDT refreshment courses are conducted at the institute training center in Bangalore, India.

Training institute can also organize NDT Courses at Hyderabad, Visakhapatnam(Vizag),Delhi, Mumbai, Nagpur, Jamshedpur, Ahmedabad,Gujarat, Chennai, Kochi, Kerala and client's venue/works throughout India and abroad with availability of sufficient candidates.

To experience professional courses in NDT e-mail us your training requirements to: training@trinityndt.com, visit and enroll at www.trinityndt.com or call 'Course Director' at +91 99009 29439.

Lamellar tearing - useful information for candidates attending NDT Training

*In general occurs beneath the T-joint welds
*can be observed in thick plates with poor through-thickness ductility
*Usually occurs in large welds
*Welding heats the steel and it expands and while cooling “Tears” the steel

To experience Quality NDT training courses in NDT e-mail us your training requirements to: training@trinityndt.com, visit and enroll at www.trinityndt.com or call 'Course Director' at +91 99009 29439

MPT by Trinity NDT- Inspection company in Bangalore, India

Magnetic particle testing-MPT by Fluorescent examination reveals severe grinding cracks throughout outer surface and inner surface of the tested sleeve components. It is suspected that the cracks are due to improper heat treatment and/or grinding operation/s. All the cracks are of network in nature and cannot be repaired to use the components further. Magnetic particle testing carried out with high sensitive magnetic particles with high intensity black light and latest NDT equipments. Entire lot rejected due to the defects.

To carry out the NDT tests, Trinity NDT is equipped with latest state of art NDT equipment to identify very fine cracks by using latest NDT technologies, equipments and qualified personnel with in-house NDT Training facilities to conduct the tests according to national/ international standards, Codes and client's specific requirements.

Magnetic Particle and Liquid/dye Penetrant Testing Capabilities at Trinity NDT:

* Magnetic particle testing and liquid/dye penetrant testing of raw materials,
components, and welds

* Magnetic particle testing -MPT can be performed to ASTM E709,ASTM A275, or other
client specified requirements

* Liquid/dye penetrant testing can be performed to ASTM E165 or other customer
specified requirements

* Testing performed by SNT-TC-1A qualified personnel with extensive experience
Portable testing equipment for onsite testing

* NDT Test Reports

* Custom NDT procedure development capability


Weld Inspection Capabilities:

* Certified NDT & Welding Inspectors

* Magnetic Particle and Liquid Penetrant Weld Testing

* Specialize in AWS D1.1 weld inspections

* Onsite inspection availability

* Weld Inspection Reports can be provided


To experience professional Nondestructive testing inspection services and training courses in India to level 1 level II e-mail us your testing and training requirements to: training@trinityndt.com, To know more about us please visit and enroll at www.trinityndt.com or call 'Course Director' at +91 99009 29439.

Stainless steels, Cast Iron- useful information for candidates attending NDT Training

Stainless Steels

Stainless steels are at least 12 percent chromium and many have high nickel contents. The three basic types of stainless are:

1. Austenitic
2. Ferritic
3. Martensitic

Martensitic stainless steels make up the cutlery grades. They have the least amount of chromium, offer high hardenability, and require both pre- and postheating when welding to prevent cracking in the heat-affected zone (HAZ).

Ferritic stainless steels have 12 to 27 percent chromium with small amounts of austenite-forming alloys.

Austenitic stainless steels offer excellent weldability, but austenite isn’t stable at room temperature. Consequently, specific alloys must be added to stabilize austenite. The most important austenite stabilizer is nickel, and others include carbon, manganese, and nitrogen.

Special properties, including corrosion resistance, oxidation resistance, and strength at high temperatures, can be incorporated into austenitic stainless steels by adding certain alloys like chromium, nickel, molybdenum, nitrogen, titanium, and columbium. And while carbon can add strength at high temperatures, it can also reduce corrosion resistance by forming a compound with chromium. It’s important to note that austenitic alloys can’t be hardened by heat treatment. That means they don’t harden in the welding HAZ.

Cast Iron

The carbon content of cast iron is 2.1 percent or more. There are four basic types of cast iron:

1. Gray cast iron, which is relatively soft. It’s easily machined and welded, and you’ll find it used for engine cylinder blocks, pipe, and machine tool structures.

2. White cast iron, which is hard, brittle, and not weldable. It has a compressive strength of more than 200,000 pounds per square inch (PSI), and when it’s annealed, it becomes malleable cast iron.

3. Malleable cast iron, which is annealed white cast iron. It can be welded, machined, is ductile, and offers good strength and shock resistance.

4. Ductile cast iron, which is sometimes called nodular or spheroidal graphite cast iron. It gets this name because its carbon is in the shape of small spheres, not flakes. This makes it both ductile and malleable. It’s also weldable.

Trinity NDT Level II (2) Courses at NDT Training center, Bangalore, India

Trinity institute of NDT technology, India announces training course schedule from 19th February 2010 at NDT Training center in Bangalore.

'Trinity NDT' SNT-TC-1A courses are comprehensive in nature. The goal of these courses is to provide a complete training program covering all the topics covered by SNT-TC-1A for the test method and prepare the student for certification as a Level I or Level II Inspector.

We try to explain each subject in practical terms and explain how it applies to actual testing applications

Hands-on time is stressed to give each student the opportunity to apply each lesson on test pieces and actual flawed specimens

Upon completion of the course, each student is given general, specific and practical tests as proof that he is prepared for certification. A course completion certificate is issued as well as detailing the results of the tests and final marks.

Salient features of our NDT Courses:

• Each Course Fee includes classroom study materials.

• All classes include metals processes and manufacturing, basic theory, industrial practices, applications,applicable safety standards, documentation, applicable standards and specifications.

• Special training sessions to explain metallurgical aspects, back ground of defects formation in different product forms by professional metallurgists and materials engineers.

• All courses include a combination of presentation and extensive hands on applications with different samples in order to reinforce learning and comprehension.

• Course instructors are ASNT Level III’s in the applicable method with minimum experience of 15 years each.

• Training and certification in wide range of NDT methods including
a. Ultrasonic Testing Level 1&2
b. Magnetic particle testing Level 1&2
c. Liquid/Dye penetrant testing Level I/II
d. Radiographic testing Level 1&2
e. Radiographic interpretation Level 1&2
f. Visual testing Level 1&2

• All courses meet or exceed industry standards like ASNT SNT‐TC‐1A

• Training programs as per specific requirements at client's locations all over India and abroad.

To experience professional training in NDT e-mail us your training requirements to: training@trinityndt.com, visit and enroll at www.trinityndt.com or call 'Course Director' at +91 99009 29439.

How Hydrogen Cracks Occur? Useful information for NDT Technicians

Whenever hydrogen cracks are generated, three things occur (are present) simultaneously:

1. Dissolved Hydrogen
2. Tensile Stresses
3. Low Ductility

This is the sequence of events leading to this deadly cracking.

a) Hydrogen enters the arc either by the shielding gas, flux or material contamination and dissolves into the weld metal itself.

b) As the weld cools, it becomes saturated in hydrogen, all of which diffuses out into the HAZ.

c) If cooled quickly (rapid), the hydrogen is retained in the 'austenite' instead of escaping.

d) The Hydrogen is trapped and seeks rifts and discontinuities in the material lattice and concentrates at these points.

e) The external stresses generated due to transformation act with the hydrogen to enlarge the 'discontinuities' to 'crack' size. This hydrogen may contribute to cracking by lowering the strength of the lattice and/or by adding to the stresses at the discontinuity level.

f) Crack growth takes the crack-root away for the hydrogen concentration and may be interrupted until the hydrogen diffuses to a new root location. This leads to the time-dependent behavior of the cracking phenomenon.
The Main Defence:

Preheat - The main reason for this heat is to assist in removing hydrogen from the weld by allowing the weld to cool slower; (diffusing hydrogen out) and remaining more ductile, thus resisting cracking.