制造稠油计量接转站配套设备２９０－２．５／０．４型水套炉时，其中的关键构件盘管（图１）因需用弯头和管子焊接预制，但盘管管径小，壁厚薄，所有焊缝均为水平固定焊接，且所处的空间位置狭窄，最小距离仅９２ｍｍ，施焊十分困难，Ｘ射线检测仪也无法工作，而盘管的内外介 The manufacture of heavy oil metering terminal equipment 290-2.5 / 0.4 water jacket furnace, one of the key components of the coil (Figure 1) due to the need to use elbow and pipe welding prefabricated, but the coil diameter is small , Wall thickness is thin, all welds are horizontal fixed welding, and the location of the space is narrow, the minimum distance of only 92mm, the welding is very difficult, X-ray detector can not work, and the coil inside and outside the media