钉头管电阻点焊工艺研究
Research on Spot Welding Process for Pin Tube
刘政军， 陈 超， 苏允海
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作者单位：沈阳工业大学 材料科学与工程学院， 辽宁 沈阳 110780
中文关键字：钉头管； 电阻点焊； 焊接工艺
英文关键字：pin tube; resistance spot-welding; welding process
中文摘要：钉头管是一种通过在光管上焊接钉头来达到增加换热面积的传热元件，是石油化工企业管式加热炉中的重要组件。本文通过金相显微镜和扫面电镜对钉头管的电阻点焊工艺进行研究，测量了不同焊接电压（电流）下焊接接头接触面积，对各参数的焊接接头进行显微组织分析，并对最佳参数的焊接接头进行断口分析。结果表明，在焊接电压为4.64 V，通电时间为0.44 s时，焊接接头的接触面积最大(达106.18 mm2,占整个焊接接头的93.9%)且未形成焊瘤，接头的显微组织最为均匀，断口为韧窝断口。
英文摘要：Pin tube, which is produced by welding pins on the tube, is a heat-transfer device. It is the most important component of industrial furnace of petrochemical company. The spot welding process of pin tube was studied by using optical microscope and SEM, the contact area of pin tube was measured under different voltage(current), the microstructure of welding joints of different parameters, and the fracture of the best parameter was analyzed. The results show that when the weld voltage is 4.64 V, circular telegram time is 0.44 s, it can get the large and best contact area. The contact area of welding joint is 106.18 mm2, it takes up 93.9% of the hole pin, and under the parameters, the welding joint can get the best microstructure, and the fracture is dimple fracture.