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20多年来,对于板厚大于10mm以上的厚板气焊,全盘机械化的气电焊工艺已成为一种很好的可供选用的方法。由滑动的铜导向板形成熔池的这种工艺的显著特点是具有稳定的焊接质量和再现性,可减少熔焊时间和具有高的熔敷效率,因此,与普通的焊接方法如手工电弧焊或气体保护焊相比,气电焊具有更大的经济性。由于焊接熔池大、焊速低和大的热输入,普通的气电焊工艺会在熔合线附近的热影响区内形成粗大而强烈定向的焊缝金属组织和明显粗大的晶粒组织。由此而造成的明显脆化是这种工艺只能用于对过热不敏感的材料的根本原因。今天,在
For more than 20 years, the whole mechanized gas welding process has become a very good alternative method for thick plate gas welding with a thickness greater than 10mm. The remarkable feature of this process for forming a weld pool from a sliding copper guide plate is that it has stable weld quality and reproducibility, can reduce the welding time and has a high deposition efficiency, and therefore, unlike conventional welding methods such as manual arc welding Compared with gas shielded welding, gas welding is more economical. Due to the large welding pool, low welding speed and large heat input, a conventional gas welding process results in the formation of coarse and strongly oriented weld metal microstructures and apparently coarse grain structures in the heat-affected zone near the weld line. The resulting apparent embrittlement is the root cause of this process, which can only be used with materials that are not sensitive to overheating. Today, at