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Welding Guide

This is what the completed weld should look like. Note the discoloration of the base material; this is known as the heat-affected zone (HAZ). Excessive heat or too slow of a travel speed can cause this area to enlarge, and on thin materials, heat is a bad thing that leads to warping. To help maintain the amount of heat, weld in small segments, and allow for cooling between welds.
Welding Guide - The Garage Guy's Guide To Welding

 This is what the completed weld should look like. Note the discoloration of the base material; this is known as the heat-affected zone (HAZ). Excessive heat or too slow of a travel speed can cause this area to enlarge, and on thin materials, heat is a bad thing that leads to warping. To help maintain the amount of heat, weld in small segments, and allow for cooling between welds.  View Related Article

 

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