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目前我国用于石油和天然气输送管线的焊剂,仍主要仿制苏联50年代的产品HJ431、HJ433等焊剂。近年来一些单位虽然研制了一些新产品,但与国外同类产品相比,在高速焊工艺性能上仍有较大差距,这些产品的焊接速度仍停留在1.3m/min至1.5m/min范围内,当焊接速度提高到1.8m/min,在螺旋管上施焊时,均产生不同程度的淌渣,气孔、麻点等缺陷,因此目前国内还没有可以胜任焊接速度为1.8m/min的高速焊剂。国外,如苏联、日本以及东欧的波兰等国,70年代就已生产多种用于管线钢的高速熔炼焊剂,焊速高于2.0m/min。80年代初,苏联和日本又相继研制出焊缝金属韧
At present, China’s flux for oil and natural gas transmission pipelines is still mainly used for the production of fluxes such as HJ431 and HJ433 produced by the Soviet Union in the 1950s. In recent years, although some units have developed some new products, compared with similar foreign products, there is still a big gap in the high-speed welding process performance. The welding speed of these products still stays in the range of 1.3m/min to 1.5m/min. When the welding speed is increased to 1.8m/min, when the spiral pipe is welded, there are defects such as slag, air holes and pits in different degrees. Therefore, at present, there is no high-speed welding with a speed of 1.8m/min. Flux. In foreign countries, such as the Soviet Union, Japan, and Poland in Eastern Europe, in the 1970s, a variety of high-speed smelting fluxes for pipeline steel were produced, and the welding speed was higher than 2.0 m/min. In the early 1980s, the Soviet Union and Japan developed weld metal toughness one after another.