Box structure welding shrinkage allowance how to place

1, width direction can not be considered, according to the conventional length direction should be 1 meter to put 1mm shrinkage allowance.

2, only with the size of the weld is some relationship, but the longitudinal contraction of the weld should be the first to the weld maximum.

3, now your weld is a = 6 that is K = 6X414 = 8.484, should be welded on the line 1 meter hair 1mm enough.