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(续上期)82采用埋弧焊如何焊接低碳钢筒形焊件的环缝?对锅炉锅筒或其它受压筒形焊件的环缝进行埋弧焊对接焊时,应使用相应的胎具,以保证筒形焊件能按选定的速度作匀速旋转。先在筒形焊件内部用外加焊剂垫来焊接内环缝。如图31所示,焊剂垫由滚轮和承托焊剂的带组成。焊接时,焊机头放在圆筒内并托架起来,使焊件按选定的焊接速度旋转。为防止熔池中液态金属和熔渣从转动的焊件表面流失,焊丝要偏
(Cont’d) 82 How to weld the girth of low carbon steel cylindrical weldment by submerged arc welding? When submerged arc welding butt welding the gasholding of boiler drum or other pressurized cylindrical weldment, the corresponding tire With, to ensure that the cylindrical weldment at a selected speed for uniform rotation. First, weld the inner ring seam with an extra flux pad inside the cylindrical weldment. As shown in Figure 31, the flux pad consists of a roller and a flux-carrying strap. Welding, the welding head placed in the cylinder and brackets up, so that the welding parts according to the selected welding speed rotation. In order to prevent molten metal pool and slag from the rotating surface of the weldment loss, the wire should be partial