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4电阻焊管的最初应用在20世纪10年代后期,美国的汽车从奢侈品逐渐变为必需品,到20世纪20年代迎来真正的汽车时代。在汽车工业扩张的同时,对钢管的需求大增,主要用于设备制造、结构、油井开采(如钻管、油套管和管线管等),因此形成了钢管市场的极大需求。在此环境下,Johnston工艺成功实现了商业化应用。电阻焊管首先开始应用于机械和结构方面,以薄壁小直径钢管为主。在这些方面原来一般采用无缝钢管,有时也采用对接焊管。因为对接焊管是在白炽状态下成型的,不能生产薄壁钢管。无缝钢管
4, the initial application of resistance welded pipe In the late 20th century, the United States from a luxury car gradually become a necessity, to the 1920s ushered in a real era of the car. As the automotive industry expands, the demand for steel pipes has soared, mainly for equipment manufacturing, construction, well drilling (such as drilling, oil casing and pipelines), thus creating a great demand for the steel pipe market. In this environment, Johnston Process successfully commercialized. Resistance welded pipe first began to be used in machinery and structure, mainly to thin-walled small diameter steel pipe. In these areas, the original general use of seamless steel pipe, and sometimes butt welded pipe. Because butt welded pipe is incandescent shape, can not produce thin-walled steel pipe. Seamless steel pipe