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本文提出的锅炉集箱管座内孔脉冲钨极氩弧焊封底,可以获得“全焊透”的管座角焊缝,能在根本上避免泄漏事故,提高角焊缝的承压强度,也是解决管座角焊缝内外全自动焊的基础。这一工艺方法的采用,具有很大的技术经济意义,以年产150万千瓦电站锅炉的工厂计算,仅在大幅度降低返修和免除泵水所带来的收益即可达数十万元。至于为电厂提高运行可靠性,减少事故停炉带来的利益更以千万元计。所介绍的焊机机头和电气控制线路,能达到集箱管座角焊缝焊接的程序控制要求。本文讨论了脉冲氩弧焊焊接规范主要参数的选择,引用了等值电流的概念。收弧裂缝是一种较为独特的热裂缝,近似于弧坑裂缝而又不同于通常阐述的弧坑裂缝。收弧裂缝主要发生在脉冲氩弧焊双面成形焊缝的背面,且正对主脉冲所形成的弧坑。提出了解决收弧裂缝的主要工艺措施是选用一种脉冲衰减的焊接规范。本文还列举了集箱管座内孔脉冲氩弧封底焊在电站锅炉生产中的应用实例。
This paper puts forward the “gutter” fillet fillet welds in the gland of the header of the header of the boiler header, which can fundamentally avoid the leakage accident and improve the compressive strength of the fillet welds. Solve the base weld fillet weld inside and outside the automatic welding. The adoption of this process has great technical and economic significance. Calculated on the basis of a plant with an annual output of 1.5 million kilowatts of power station boilers, it can only cost hundreds of thousands of yuan only by significantly reducing the rework and pump-free benefits. As for the power plant to improve operational reliability, reduce accidents more than 10 million yuan to bring the benefits. The introduction of welding machine head and electrical control circuit, to achieve header weld fillet welding process control requirements. This article discusses the selection of the main parameters of the PIGA welding specification, citing the concept of equivalent current. Arc arc crack is a more unique hot crack, similar to the crater and crater but different from the usual crater. The arc crack occurs mainly in the back of the double-sided forming weld of the pulse argon arc welding, and is opposite to the crater formed by the main pulse. Proposed to solve the arc crack main process measures is to choose a pulse attenuation of the welding specifications. This article also lists the case of header socket pulse argon arc back-welding applications in power plant boiler production.