Joints with multi-layer multi-pass welding
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Why is it required that joints with multiple layers and passes of welding be offset by 3 centimeters?
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It seems a bit common sense, right? Similar to the staggered arrangement of the longitudinal welds on the cylinder shell~
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I believe the offsetting of joint positions is based on two considerations: one is stress concentration at the joint location； The second is that the likelihood of joint defects is relatively high.
On pressure vessels, the amount of this offset is determined based on the weld type and standards. I don’t understand other types of devices
Avoid stress concentration at welding joint locations
It’s like taking over the area where the hole is made; it should not be created at the welds of the cylinder and the head. If it is not moved aside, the subsequent welding will definitely affect the previously welded area.
There are also reasons to avoid the concentration of defects
Are multi-layer, single-pass weld joints not required to have an offset? ? ?