水下高压干式环境下压力及焊接参数对GMAW焊缝成形的影响
Effect of pressure and welding parameters on weld bead geometry of GMAW in underwater hyperbaric dry environment
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摘要: 开展水下高压干法焊接试验研究,在焊接过程相对稳定的情况下,以环境压力、焊接电流、保护气成分、焊丝伸出长度为变量,探索其对于焊缝截面成形的影响规律. 采用正交试验方法,通过试验确定了焊缝熔深、熔宽及余高随上述变量的变化规律. 结果表明,随着环境压力增大,焊接飞溅增多,熔深增加,熔宽减小,余高增高;高压环境下,随着焊接电流增大,熔宽没有明显变化,熔深增加,余高略有增加;随着保护气中CO2比例的增加,熔深减小,熔宽增加,余高变化不明显;随着焊丝伸出长度增加,熔深减小,熔宽增加,余高增加.Abstract: Underwater hyperbaric welding was conducted, with the ambient pressure, welding current, composition of welding gas and electrode extension as variables, to investigate the influence on the weld bead geometry. The variation trends of weld penetration, weld width and reinforcement with the above variables were determined by orthogonal experiments. The results show that with the increase of ambient pressure, the welding spatters, weld penetration and reinforcement increased, but the weld width decreased. In hyperbaric environment, with the increase of welding current, the weld width did not change significantly, but the weld penetration increased and the reinforcement also increased slightly. With the increase of CO2 ratio in shielding gas, the weld penetration decreased, the weld width increased, but the reinforcement had no obvious change. With the increase of electrode extension, the weld penetration decreased, the weld width and reinforcement increased.
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Keywords:
- hyperbaric welding /
- gas metal arc welding /
- weld bead geometry /
- spatter
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