我厂生产的液压汽车起重机,吊臂断面形状原为四边搭角箱形结构,以手工电弧焊完成四条角焊缝。随着起重机吨位增大和新材料的应用,吊臂断面采用了腹板折边形式。角焊缝呈窄间隙喇叭状,手弧焊由于熔深浅已不能满足要求。为此,我们 I plant the production of hydraulic truck crane, crane cross-section shape of the original quadrangular angle box-shaped structure, the completion of four arc welding by hand arc welding. With the increase of crane tonnage and the application of new materials, the cross section of the boom adopts the form of web flange. Fillet weld was narrow gap trumpet-shaped, hand arc welding due to shallow depth can not meet the requirements. For this, we