Second only to safety, quality is the most important endeavor in any welding operation. At the mention of the word "WELDING" you will often find it closely followed by terms such as: Certification - Specifications - Procedures - Standards - Codes - Qualifications and so forth; This is all to insure the safety, integrity and quality of the weld and the welding operation.
In the absence of instituting a conscientious quality control program into your welding operation; you may be bound to producing defective welds.
A weld defect can be defined as an irregularity, discontinuity, imperfection or inconsistency that renders the welded object unsuitable for its intended use.
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 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, Certified Welding Inspectors and TESTING LABS:
The Quality Control process may include:1. Visual Inspection
2. Non Destructive Examination
3. Mechanical or Destructive Test
4. Failure Analysis
1.Examining irregularities, discontinuities, imperfections, inconsistencies and classifying them as acceptable or as a weld defect. 2.
Classifying the tolerance or acceptance level, the defect may be classified 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.
The key to good welding
The key to producing sound weldments and eliminating weld defects is to follow accepted welding specifications & procedures thru a consciensious quality control program and to master the WELDING PROCESS VARIABLES
Each welding process has its own set of variables that must be identified, controlled and mastered. When you master the process variables, you will indeed produce outcomes that are: advantageous, predictable, favorable, repetitive, reliable and thus profitable.
Practical Performance Tests
Practice Practice Practice
You could be practicing the same mistakes! over! and over! and over! again and not making any or little improvement all while expecting a different result or a more favorable outcome and not getting it.
Plan and Predict your Progress.
Practice Proper Proven Productive Procedures.
If you are not getting better then you have gotten worse.