1. Which welding process produces the smallest
heat-affected-zone (HAZ)?

Laser Welding

Explanation:

Step 1:  Let us first define what Heat-Affected-Zone (HAZ) is

According to https://www.twi-global.com, the heat affected zone (HAZ) is a non-melted area of metal that has undergone changes in material properties as a result of being exposed to high temperatures. These changes in material property are usually as a result of welding or high-heat cutting. The HAZ is the area between the weld or cut and the base (unaffected), parent metal.

Step 2:  Which welding process produces the smallest HAZ?

According to https://www.weiss-aug.com, Laser welding may still use filler material, but it results in a very small heat affected zone, and may need a lot less in terms of follow-up processes than products welded through traditional methods.

 Laser Welding

answer:

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