摘 要:随着我国汽车行业的快速发展和尾气排放要求的提高，对汽车尾气净化器的产量和质量提出了更高的要求。汽车排气系统为管状结构的连接，净化器是其中的一部分，其生产方式主要是焊接加工，焊接方式过去是半自动人工气体保护焊，人工焊接的产品质量不够稳定、生产效率比较低还存在安全保障问题，随着产品数量和质量要求的提升，已不能满足生产实际的需要；现在工厂多采用焊接机器人，但存在投资费用大，使用维护成本和对焊材质量的要求高等问题；针对这一问题在兼顾焊接质量、生产效率和降低生产成本的前提下，研制了汽车净化器环缝焊接专用焊机。

　　　本文分析了汽车尾气净化器零部件的结构特点和材料特性，研究了该零部件的焊接原理和焊接方式，明确了该零部件的焊接工艺和焊接要求；为提高环缝的焊接效率，确定了双环缝焊接专机的开发思路；研究了环缝焊接起弧、收弧的方式特点和焊缝轨迹形成的要求，进行了专机的整体设计，开发了专机的驱动机构、焊接夹具系统、焊枪调整机构和整机的控制系统。

关键词：汽车尾气净化器；焊接专机；双环缝

ABSTRACT:With the rapid development of automobile Industry and the stricter requests on the exhaust emissions in our country, there is a higher request to the automobile exhaust purifier's output and the quality. The connection of automobile exhaust system is tube structure, and the purifier is one part of them. Its mainly production method is welding processing. The welding manner in the past was the semi-automatic manual gas shielded welding. The quality of manual welding product is not very stable, and the production efficiency is quite low, and also exists safety control problem. Along with the promotion of the quantity and quality requirement, It can not meet the production actual needs; Now many factories use welding robot, But it costs too much investment expenses, the maintenance cost and the welding materials quality request is high. In view of this problem, In the proper attention to both welding quality, the production efficiency and the production cost reduction, has developed the automobile purifier link seam weld special-purpose welding machine.

　　　This article has analyzed the automobile exhaust purifier spare part unique feature and the materials characteristic, has studied this spare part welding principle and the manner, and has been clear about this spare part welding process and request; In order to improve the link seam’s welding efficiency, has determined the development thoughts on double circular welder weld special plane; Studied the circular welded characteristic of arc startingand receiving arc,Has carried on special plane's overall design, and developed special welder’s driving mechanism, the welding fixture system, the welding torch adjusting mechanism and the complete machine control system.

Key words: Automobile exhaust purifier；Special Welding Machines；Double circular welded