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BJ-3型焊条系采用鑄铁焊芯,涂料中含有石墨,通过焊芯向焊縫金屬过渡硅和鋁,涂料中的石墨用以补充焊接过程中碳的燒損,从而提高了焊縫金屬石墨化的能力。在配合低温預热的条件下,可以焊补非工作加工面和工作加工面,所得到的焊縫金屬为灰鑄铁組織,色澤与母材一致,熔合区的硬度不超过H_B240,可以进行机械加工,在生产中使用效果良好。本文着重叙述了硅、鋁对焊縫金屬性能的影响、焊接工艺方法和在生产中应用的实例。
BJ-3 type of welding rod is made of cast iron core, the coating contains graphite, silicon and aluminum pass through the welding core to the weld metal, graphite in the coating is used to supplement the burning of carbon in the welding process, thereby improving the weld metal Graphitization ability. In conjunction with the low temperature preheating conditions, you can weld non-working surface and the working surface, the resulting weld metal is gray cast iron, the same color and base metal, the hardness of the fusion zone does not exceed H_B240, can be mechanical Processing, the use of good results in the production. This article focuses on the silicon, aluminum on the weld metal properties, welding process methods and examples of production applications.