1. The weld surface shall be smooth and dense, and there shall be no defects such as blowholes, incomplete fusion, incomplete penetration, overburning and cracks. These defects will reduce the strength and corrosion resistance of the weld.
2. Smooth transition of parent metal: there should be a smooth transition between weld and parent metal, and there should be no sag, bulge and dislocation. These phenomena will affect the appearance quality of weld and reduce its aesthetics.