此类阀门具有质量大、形状特殊、 焊接可达性差，焊接质量要求严格等特点；
The valve is characterised by heavyweight, special shape, bad welding performance, but demanding excellent welding quality etc.
从机器人柔性焊接系统设计的角度出发，分析了推土机后桥箱的结构特点和可达性，明确了焊接工装设计思路。
From the perspective of flexible welding robot system design, analyze the structure feature and welding accessibility of rear axel housing for bulldozer and clarify the approach of fixture design.
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