What is toe weld?

As an AI language model, I'm assuming that you're talking about "TIG" weld.

A TIG (tungsten inert gas) welding, also known as "GTAW" (Gas Tungsten Arc Welding), is a method used to join metals such as steel, titanium, aluminum, and copper. TIG welding uses a non-consumable tungsten electrode that produces the electric arc to melt the metal. The welding process is aided by the use of an inert gas, usually argon, which is used to shield the weld area from atmospheric contamination and prevent oxidation.

Toe weld is the part of the weld that forms at the bond line, or the point where the metal pieces meet. It is the area of the weld where the heat input is highest, and where the weld pool and metal meet. Toe welds are typically the most critical in terms of the strength and quality of the weld, as well as the appearance of the finished weld. Careful attention to detail is required to ensure that toe welds are properly formed and that the entire weld is structurally sound.