WelderTraining & Certification

 

4. WELD DEFECTS
 A weld defect can be defined as an irregularity, discontinuity, imperfection or inconsistency that renders the welded object unsuitable for its intended use. 

 The integrity of welds are assured through Quality Control programs conducted by highly educated or trained individuals such as Welding Engineers, Quality Control Engineers, Metallurgical Technicians, Non-Destructive Test and Mechanical Test Engineers, and Certified Welding Inspectors.

 The Quality Control process may include:

A. Visual inspection

B. Mechanical / Destructive Test

C. Non-Destructive examination

D. Failure Analysis

Weld Failure
 The quality of welds are sometimes classified into three categories:
Class A or Class I welds:
Failure of the weld could result in a catastrophe such as the collapse of a structure, the explosion of a pressure vessel, severe injury or loss of human life in the malfunction of equipment.
Class B or Class II welds:
Failure of the weld could result in less severe consequences than a Class A or Class 1 weld; but could cause a substantial problem.
Class C or Class III welds:
Failure of the weld may be of minimum consequences.
 

The Quality Control Process may include:

Examining irregularities, discontinuities, imperfections, inconsistencies and classifying them as acceptable or as a weld defect.

 

Classifying the tolerance or acceptance level of the weld defect as rejectable. Usually this is specified in conjunction with a cognizant document, code or standard that is used to conduct the examination, test or inspection.

Classifying the defective weldment as reworkable / repairable or as rejectable scrap.

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TASK LIST I * TASK LIST II * TASK LIST III
PERFORMANCE SPECIFICATION * PERFORMANCE PROCEDURE * PERFORMANCE QUALIFICATION

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http://www.WelderTrainingandCertification.com * Lamont@MasterWelder.com