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目前应用鑄鉄冶焊的主要方法是气焊、电弧焊、飦焊等,但存在以下問題:易产生白口組织而不能加工;产生裂纹影响机械性能;产生气孔而降低工件气密性;熔合不好影响施焊質量。采用(CO_2+O_2)混合气体保护冶焊铸铁工艺,基本解决了以上諸問題。一、混合气体保护冷焊铸铁的特点 1.混合气体保护冶焊采用小电流小規范快焊速,保护气体流量較大,相比之下熔深較小,这就限制了焊縫的綫能量輸入,
At present, the main methods of metallurgy and metallurgy are gas welding, arc welding and 飦 welding. However, the following problems exist: easy to produce white-stained tissues and processing; cracks occur to affect mechanical properties; porosity is generated to reduce the airtightness of workpieces; Good influence on the quality of welding. The use of (CO_2 + O_2) mixed gas protection of smelting cast iron process, the basic solution to these problems. First, the mixed gas protection of cold-welded cast iron characteristics 1. Mixed gas protection welding with small current small standard fast welding speed, shielding gas flow larger, in contrast to the smaller penetration, which limits the weld line energy enter,