Pay attention to the structural design of fillet welds. The main fillet welds of the vessel:
Cylinder body and jacket welding, cylinder body and plate head welding, flat welding flange and nozzle welding, support and cylinder body welding
Fillet welds-most of the grooves are manually processed and welded by hand; there are defects: not filled, not penetrated, not fused, pores, cracks.
Stress at the fillet weld: tensile stress, bending stress, and shear stress, there is a high stress concentration, the bending stress and the shear stress are weak, and the fatigue resistance is weak.