Welding

Microhardness was also taken across the welded area of a galvanized steel lap weld. It was found that the hardness slightly decreases in the fusion and heat affected zones. This is an indication that the weld does not experience embrittlement due to oxides or zinc impurities. Therefore, a weld is produced with uniform strength and ductility. The heat-affected zone is also minimal for the weld as seen in Figure 3.

 

 

Figure 3: Average hardness plotted against distance
across the weld for galvanized steel lap weld as
well as a micrograph of the galvanized steel
lap weld, 18.5 X magnification, 2% Nital etch.