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3、纯镍的手工电弧焊 (1)焊条纯镍焊条药皮一般采用碱性低氢型,以减少焊缝金属中氢、氧的含量及提高焊接接头的机械性能。纯镍焊条的焊芯成份接近基体金属的成份。表4列举了五种焊条药皮的配方,国产的纯镍及镍基合金焊条列于表5。下面简要介绍两种国内自制的纯镍焊条。 a、TiO_2—CaF_2—Na_3AlF_8渣系焊条,在该焊条药皮中适当增加细化晶粒的变质剂和脱氧剂。具体配方如下(按重量百分比计算):
3, pure nickel arc welding (1) electrode Pure nickel electrode coating commonly used alkaline low hydrogen type, in order to reduce the weld metal hydrogen and oxygen content and improve the mechanical properties of welded joints. Pure nickel welding rod core composition close to the base metal components. Table 4 lists five formulations of electrode coating, domestic pure nickel and nickel-based alloy electrodes are listed in Table 5. The following briefly introduces two kinds of domestic pure nickel electrode. a, TiO_2-CaF_2-Na_3AlF_8 slag electrode, in the electrode coating to increase the grain refinement modifier and deoxidizer. Specific formula is as follows (by weight percent):