Gas tungsten arc welding GTAW , or tungsten inert gas TIG welding, often is thought of as the most difficult welding process to master. Fortunately for welders, several technological advances have occurred, forcing many to rethink their assumptions.
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Riding the right wave in aluminum welding - The Fabricator
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Handbook - Welding Techniques
I have heard some people say that with all welding, you must have deep or maximum penetration into the base plate in order for a weld to be strong. If you have shallow penetration, the weld is weaker.
Weld Fusion vs. Weld Penetration
Welds may not be the first thing that comes to mind when a magnificent skyscraper or immaculate vintage vehicle catches your eye, but it should be. Everything we see or use in our daily lives was welded or made by equipment that was.