说明:MAGNA303焊芯是以铬镍合金为主的高效率、高强度焊条。几乎可以焊接所有钢材。可交直流两用,采用直流电源,焊条接正极。具有优良的焊接工艺性能,电弧稳定,焊缝均匀美观,在有油、水及铁锈的条件下也能焊接效果优异。焊接时应采用短弧,脱渣容易,飞溅少,具有优良的塑性、韧性、抗裂性能。可以焊接不同的钢:如高碳钢、工具钢、结构用高强度钢、弹簧钢,奥氏体高锰钢等。在堆焊时,可用作缓冲层。
用途:常用于工具钢与模具钢的维修,弹簧、钒钼弹簧钢及异种钢的焊补,断螺栓的移除等
焊缝金属的主要化学成分:
Cr Ni Mn Fe
25-35% 8-12% 1-2% 余量
焊缝接头的机械性能:
实验项目 一般结果
抗拉强度 110,000-120,000psi(78kg/mm -85kg/mm )
屈服强度 60,000-90,000psi(42.5kg/mm -63kg/mm )
伸长率百分比(2″) 22-25
布氏硬度 236
V-夏比实验冲击数值 37ft-lbs于68°F
28ft-lbs于-58°F
参考电流:
焊芯直径(mm) 2.4 3.2 4.0 4.8
焊接电流(A) 40-80 65-120 90-150 140-220
注意事项:
1:焊缝热膨胀-收缩率较低,使开裂的机会减至最低。
2:厚度较大的工件应先开好90°V型坡口。
3:焊接高碳钢前须预热200℃;焊接弹簧钢时要控制焊接温度,以防弹簧软化。
4:焊接时须用短弧操作,以窄焊道运条。特别是在带水或水中焊接时,焊条要与工件成一定角度,采用自耗式焊接,接触工件走直线,
5:应待焊缝金属冷却后再除渣。
6:在400℃或以下的工作环境下,焊缝能保持其高强度及耐用性。



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