小直径管的手弧焊难度较大,焊接过程中容易产生裂纹、未焊透、气孔和夹渣等缺陷。为焊好小直径管,根据多年操作经验,浅谈一下水平固定管、垂直固定管、45°固定管的施焊方法及要领。水平固定管焊接水平管固定焊接,是指管子吊在水平位置,进行仰、立、平焊的全位置焊接。例如,φ50×5毫米20号钢管,开V型60°坡口,钝边为1毫米。选用φ3.2毫米结422焊条,接头间隙上部为3.5毫米,下部为3毫米。焊接电流为95～100安。定位焊一处(由立焊向平焊过 Small-diameter hand arc welding hand more difficult to crack in the welding process, not penetration, porosity and slag and other defects. For the welding of small diameter pipe, according to years of operating experience, talk about horizontal fixed pipe, vertical pipe, 45 ° fixed pipe welding methods and essentials. Horizontal fixed pipe welding horizontal pipe fixed welding, refers to the tube hanging in the horizontal position, Yang, Li, flat welding of the full position welding. For example, φ50 × 5mm steel pipe No. 20, open V-60 ° bevel, blunt edge of 1 mm. Use φ3.2 mm knot 422 electrode, the upper part of the joint is 3.5 mm, the lower part is 3 mm. Welding current is 95 ~ 100A. Location welding a (by the vertical welding welding