Tensile test – fracture location
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Was any metallographic analysis performed on the fracture surface after someone conducted a tensile test? What I want to know is: do fractures generally occur more frequently in the HAZ or the WZ area? I personally prefer HAZ (of course, when there is a good match between the welding material and the base material, etc.). Thank you~~~
In my opinion, it should also be in the heat-affected zone. From a purely mechanical perspective, the tensile strength of carbon steel and low-alloy steel welding electrodes should not be more than 30 Mpa higher than that of the base material; therefore, the strength of the weld metal should be greater than that of the heat-affected zone. Thus, in the event of a fracture, the heat-affected zone represents a greater risk~~~~
Theoretically, Haz is abundant; the recrystallization zone of haz is coarse, hard, and brittle with poor toughness. Both the area within the wz fusion line and the normalizing zone of the HAZ constitute a heat treatment effect; air cooling after welding is equivalent to normalizing, resulting in fine grains, high strength, slightly lower hardness, and high impact toughness
Agree with the above view; generally, the strength of a weld is superior to that of the base material
It’s hard to say; there’s no need to investigate this issue, right? The base material’s tensile strength being at the upper limit specified by the standards, the welding material’s tensile strength being at the lower limit specified by the standards, or vice versa, all play a role in determining this issue.