过去,国内液化石油气钢瓶制造多采用单层或双层埋弧焊接主环缝,焊缝质量不高,并常出现咬边、气孔等缺陷,产品合格率一般仅为30～70％。现在打底焊道采用等离子弧焊接,然后用埋弧焊盖面,完成主环缝的焊接。采用这种工艺制造的钢瓶,产品合格率提高到95％以上,并且成本低、见效快,受到了铜瓶制造厂的欢迎。 In the past, the domestic production of liquefied petroleum gas cylinders using single or double submerged arc welding the main ring seam, weld quality is not high, and often appear undercuts, porosity and other defects, the product pass rate is generally only 30 to 70%. Now backing weld plasma arc welding, and then use submerged arc welding cover to complete the main ring seam welding. Cylinders made using this process, the product yield increased to 95% or more, and low cost, quick, by the copper bottle factory welcome.