我公司主导产品为包装机械，加热箱是其主要配套产品，属一类压力容器。在制造中有大量如图１所示角焊缝。初期因产量不大，我们按图１所示用手工电弧焊，随着产量增大，为提高效率，降低成本，消除手工焊的不利因素，实行了埋弧自动焊。由于埋弧自动焊的特殊性，这些角焊缝只? My company leading products for the packaging machinery, heating boxes are its main ancillary products, is a type of pressure vessels. In the manufacture of a large number shown in Figure 1 fillet weld. Due to the initial production is not large, we use the manual arc welding shown in Figure 1, with the increase in production, in order to improve efficiency, reduce costs and eliminate the disadvantages of manual welding, the implementation of submerged arc welding. Due to the special nature of submerged arc welding, these fillets only?