For a long time, the traditional design principle of welded structure is strength design. In the actual welding structure, there are three kinds of relationship between weld and base metal strength:
1, the weld strength is equal to the parent material (equal strength matching).
2, weld strength beyond the parent material (super match, also called high strength match).
3, the weld strength is lower than the parent material (low strength matching).
In the era of the pursuit of automation, welding has become one of the most versatile skills, and the strength of automatic welding joints become a big test, if the weld toughness is significantly reduced, then the use of low strength matching more favorable.
Considering the safety and reliability of the structure, the strength of the weld seam is at least equal to the strength of the parent material, which is called the "equal strength" design principle.
However, in actual production, most of the welding materials are selected according to the strength of the deposited metal, and the strength of the deposited metal is not the actual strength of the weld.
Deposited metal is not equivalent to weld metal, especially low alloy high strength steel welding material, the weld metal strength is often higher than the strength of the deposited metal.
So, there will be the name of the "strong" and the actual super results.
No matter from which side, the matching problem of the welding head, should be considered before the specific operation, after all, he is related to the correct operation of the project and acceptance quality problems.
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