我厂制造了一批蒸球,球体内径为3650毫米,球体的壳板是由厚16及20毫米的20 g 锅炉钢板组成的焊接结构。球壳的形状见图1。国外球形结构件仍然采用手工电焊。而我们考虑到自动电焊比手工电焊有许多优点,如:(1)由于焊接过程中加热不均匀而产生的结构变形较小,可以简化甚至可以免除火工整形的工序; I plant to create a number of steamed balls, the ball diameter of 3650 mm, the ball shell is made of 20 g thick 16 and 20 mm boiler plate welded structure. The shape of the shell is shown in Figure 1. Foreign spherical structure is still using manual welding. And we consider automatic welding than manual welding has many advantages, such as: (1) due to uneven heating caused by the welding structure deformation is small, you can simplify or even exempt fireman shaping process;