窄坡口等离子-MAG复合焊工艺参数优化
Optimization of narrow groove plasma-MAG hybrid welding process parameters
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摘要: 针对转向架构架焊接变形及根部焊道背部成形问题，研究坡口角度为30°的V形窄坡口旁轴式等离子-MAG复合热源焊接工艺.文中以SMA490BW耐候钢平板对接为研究对象，基于响应面法建立了主要影响熔深的等离子电流、MAG电流、焊接速度、等离子气体流量与焊缝根部焊道的熔深、背部余高之间的数学关系模型，并依此模型分析了等离子-MAG复合焊接工艺参数对焊缝熔深能力的影响，获得了合适的复合焊接工艺参数.与普通MAG焊相比，窄坡口等离子-MAG复合焊接工艺既可保证焊缝根部完全熔透又能有效地减小接头的焊接变形.
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关键词:
- 等离子-MAG复合焊接工艺 /
- 响应面法 /
- 参数优化 /
- 焊接变形
Abstract: The side-axis plasma-MAG hybrid welding process with V-style 30° narrow angles was conducted to solve the problems of the MAG welding deformation and the back shaping of the root weld bead for bogie frame. In this paper, the butt plate of SMA490BW weathering steel was regarded as the research object. A mathematical relationship model was established between the plasma current, MAG current, welding speed, plasma gas flow which affect the weld penetration and the penetration, back reinforcement of root pass based on response surface method, and by means of this model, the influence of the plasma-MAG hybrid welding process parameters to the weld penetration capability was analyzed, so as to get the suitable hybrid welding process parameters. Compared with the ordinary MAG welding process, the narrow-groove plasma-MAG welding process is able to ensure the full penetration of weld root and to reduce welding deformation of the joint effectively. -
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