Orbital TIG welding of stainless steels today represents a method of high-quality joining
of pipelines in the pharmaceutical and food industries. The process also requires
shielding gases to prevent oxidation of the weld joint. In the thesis, we demonstrated
the influence of O₂ and the type of shielding gas on the quality of weld joints in
orbital TIG welding of stainless steels. Based on experiments, we found that in the
production of butt welds, the O₂ concentration already at 400 ppm has a visible
effect on the quality of the weld joint. We also found that when the O₂ concentration
is above 200 ppm, the quality of the welding joint is significantly affected by the
quality of the shielding gas. We consider most important the finding that N₂ gas is
the most economically advantageous for the production of weld joints in orbital TIG
welding of stainless steels.
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