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发动机缸体材料为铸铁。用手弧焊等方法焊补,母材焊接性差,易出现缺陷,焊接成本也高。选用火焰钎焊,成本低,钎焊性能也适应焊补要求。钎料选用BCu_(62)ZnNiMnSi-R,也可用铜锌焊条,钎剂选用FB301,即硼砂或硼砂与硼酸的混合物。选用氧乙炔气焊设备和HO1-12或GO1-30焊炬。钎焊时,钎料的润湿角应小于20°。在有氧化物的母材表面上,液态钎料往往凝聚成球状,不与母材发生润湿,因为覆盖
The engine block is made of cast iron. Welding by hand arc welding and other methods, poor base metal welding, prone to defects, welding costs are high. Selection of flame brazing, low cost, brazing performance also meet the welding requirements. Solder material used BCu_ (62) ZnNiMnSi-R, also available copper and zinc electrode, flux selection FB301, namely borax or borax and boric acid mixture. Use acetylene gas welding equipment and HO1-12 or GO1-30 welding torch. Brazing, solder wetting angle should be less than 20 °. On the surface of an oxide base metal, the liquid solder tends to coalesce into a spherical shape without wetting with the base metal, as the covering