求教焊接方面英语? the reverse side of double-welded vertical butt joints shall be back-chipped, ground or flame-gouged before the application of the first run of welding on this side, in a manner which will leave the exposed surface accessible and satisfactory for the fusion of the weld metal to be added. at the discretion of the principal this requirement may be relaxed when the back of the metal run is smooth and free from crevices which might entrap slag, and when the principal is satisfied that the required weld quality will be maintained. if back-gouging is applied, grinding to bright metal is required. 纵焊缝采用双面焊时,背面第一道焊缝施焊前应清根、打磨或者火焰刨削,以确保母体能够与焊材融合。如果金属背面光滑且没有容易产生焊渣的裂隙,可以保证焊接质量时,则不必进行清根。如果需要进行清根,必须保证母材露出明亮的金属本色。查看更多