List the factors to consider regarding the number of tack welds.
What will be an ideal response?
The following are some of the factors to consider regarding the number of tack welds:
Thickness of the metal-A large number of very small tack welds should be used on thin metal sections, while a few large tack welds may be used for thicker metal parts.
Length and shape of the joint-Obviously, short joints take fewer welds; but some long, straight joints may have very few tack welds compared to a shorter joint that is very curvy.
Welding stresses-All welds create stress in the surrounding metal as they cool and shrink. Larger welds produce greater stresses that might pull tack welds loose from an adjoining part if the tack welds are not strong enough to withstand the welding stresses.
Tolerance-The more exacting the tolerance for the finished weldment, the more tack welds are required.
Fitup-When custom bending parts during the fitup process, it may be necessary to use a large number of small tack welds to keep the parts in alignment and make the bends more uniform.
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