Metal expands as it is heated and contracts as it cools. Keeping the heat input even, completely around the pipe, will help. If possible reheating the weld area after the weld is complete can help to "stress relieve" the joint. Using a weld "fixture" to prevent bending is another possibility.
forgot to mention its for welding gas pipes the yellow ones
It depends on the material of the pipes
Welding with cast iron welding rods
Past continuous is formed with - was/were + verb +ingwas weldingwere welding
4MM..
Plumbers that solder pipe together, also known as welding of the pipes.
Type your answer here... no
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Plumbers that solder pipe together, also known as welding of the pipes.
By rolling and welding flat plates or more commonly by the extruding process.
pipe bender(bend-pak)
Tungsten Inert Gas (TIG)