Weld shrinkage dimension
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As shown in the dimensions above, there is a gap of 0.3~0.5δ in the middle of the weld. In actual production, should a margin be left in the cylinder to prevent the weld contraction from causing the dimensions to fall short of those specified in the drawings? How much margin should be left?
There is no need to consider excess material; the key is to control this dimension to ensure good fusion at the bottom of the weld, while also minimizing the amount of weld metal filler.
I’ve never controlled the size of this place before – is it the supervisor causing trouble again?
This is used to ensure full penetration of the weld; the size requirements are quite broad, so it’s not that complicated
This structure is used for welding between the cylinder, tube sheet, and tube box, right? Riveted and welded structures do not need to be as precise as machined parts; if riveting and welding could achieve the same level of precision as machining, then machining would no longer be necessary. Welding deformation and shrinkage are inevitable; a slight shrinkage can be corrected by using bolts to pull it back. To achieve precision of several tens of microns, it is necessary to leave sufficient margin and carry out machining after welding.