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The weld seam is formed by melting and connecting the welding rod and the metal at the joint using the high temperature of the welding heat source. After the weld metal cools down、 the two welding components are connected as a whole. According to the shape of the weld metal and the different positions of the welded parts、 it can be divided into butt welds、 fillet welds、 plug welds、 and electric riveting welds. Butt welds are commonly used for splicing plates and steel sections; Fillet welds are often used for lap joints; Plug welds and electric riveting are less commonly used and are only considered to reduce the overlap length of the weldment
During fusion welding、 the ratio of the weld width (c) to the calculated weld thickness (s) on the cross-section of a single weld seam is called the weld seam forming coefficient、 which is c/s. When the weld seam forming coefficient is small、 a narrow and deep weld seam is formed. In the center of the weld seam、 due to regional segregation、 more impurities will accumulate and the resistance to thermal cracking is poor. Therefore、 the forming coefficient value cannot be too small. For example、 in automatic submerged arc welding、 the weld seam forming coefficient should be greater than 1.3、 The width of the weld seam should be at least 1.3 times the calculated thickness of the weld seam
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