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TIG welding. TIG welds can be closer to pure than other processes but the strength of a weld is determined by a variety of factors. The choice of filler material usually determines the strength of a weld. For example type 12018 electrode, using the SMAW process, can be used to weld almost any strength steel and the weld will have a tensile strength close to 120,000 lbs/square inch. Heat treatments, both pre and post, can alter a welds strength. Additions of alloying elements (flux and electrode coatings) can also improve weld strength.

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Q: Which type of welding is strongest?
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