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Cleanliness is next to godliness when it comes to TIG quality, since TIG is particularly sensitive to contaminants like scale, rust, paint, grease, even fingerprints, all of which can severely compromise the weld’s integrity. Right after that is tight fitment. While MIG can easily cheat and bridge large gaps with extra material, with TIG it pays to take time to make tight joints. This will not only make the weld easier and better looking, but also stronger.