螺旋缝埋弧焊管内外自动焊焊枪结构设计

Design of Structure of Welding Torch for Automatic Internal/External Welding of HSAW Pipe

介绍传统焊枪和新设计埋弧焊管内外自动焊焊枪的结构,分析新型埋弧焊枪的工作原理,对比两种焊枪在生产中的应用情况。分析认为:与传统焊枪相比,新设计的埋弧焊枪能始终保证焊丝与导电嘴一侧接触,保证焊接时焊丝的位置稳定,通过风冷可以有效降低焊丝温度,同样工况下提高了焊缝形貌及理化性能结果。新设计的焊枪结构仍存在短板,无法针对多丝焊进行调节;焊接内径较大的焊管时,利用传导机构调节内焊丝位置较容易,管径小时则不易操作。建议与自动化测量技术相结合,根据导电嘴损耗自动调节焊丝位置,避免因忘记手动操作或位置局限难操作等引起的焊丝位置偏离而造成的产品质量问题。

Described are the structures of the conventional welding torch and the newly-designed welding torch for automatic internal/external welding of the HSAW pipe. Analyzed is the operational principle of the latter. Compared are the industrial application statuses of the said two torches. The analysis reveals that compared with the conventional welding torch,the newly-designed welding torch for the HSAW pipe is capable of ensuring that the welding wire keeps in any case contacting the tip side,and the welding wire is stably positioned during the operation process. It is also revealed that the welding wire temperature can be obviously lowered down via air-cooling so as to enhance the morphology and physiochemical properties given that the working conditions remain the same. Nevertheless the new welding torch has its short comings,for instance,in case of multi-wire welding,no adjustment can be made,and when welding pipes with rather large ID,it is rather easy to adjust the welding wire position with the conduction mechanism,whereas in case of welding smallsized pipes,it is not so easy to manage the same thing. Therefore it is suggested to combine the automatic measurement technology to get the welding wire position adjusted automatically as per the current contact tip loss so as to prevent any product quality problem as caused by deviation of the welding wire position as resulting from forgetting manual operation or failing to operate due to location limitation.