nondestructive weld examination
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Page 7The ABC's of Nondestructive Weld Examination
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Page 7The ABC s of Nondestructive Weld Examination
1/10/2013 11:09:01 AMhttp://www.ndt.net/article/0698/hayes/hayes.htm
for interpretation of RF or
video patterns.
Choices Control Quality
A good NDE inspection program must recognize the inherent limitations of each process. For example, both radiography and ultrasound have distinct orientation factors that may guide the
choice of which process to use for a particular job. Their strengths and weaknesses tend to complement each other. While radiography is unable to reliably detect lamination-like defects,ultrasound is much better at it. On the other hand, ultrasound is poorly suited to detecting scattered porosity, while radiography is very good.
Whatever inspection techniques are used, paying attention to the "Five P's" of weld quality will help reduce subsequent inspection to a routine checking activity. Then, the proper use of NDE
methods will serve as a check to keep variables in line and weld quality within standards.
The Five P's are
1. Process Selection. The process must beright for the job.
2. Preparation. The joint configuration must beright and compatible with the welding process.3. Procedures. The procedures must be spelledout in detail and followed religiously duringwelding.4. Pretesting. Full-scale mockups or simulatedspecimens should be used to prove that theprocess and procedures give the desiredstandard of quality.
5. Personnel. Qualified people must be assigned to
the job.
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Copyright Rolf Diederichs, [email protected]. June 1998/DB:Article /DT:tutor /SO:AWS /AU:HAYES_CHARLES /CN:US/CT:NDT /CT:weld /ED:1998-06