Q & A details -What should be paid attention to when surfacing welding cast wc?
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What should be paid attention to when surfacing welding cast wc?

1 answer Reward0 Deadline 2020-04-09 10:49:00

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  • 0865598567

    0865598567 2019-04-19 10:50:58

    ① Before surfacing, the surface of the surfacing part should be carefully cleaned with a steel brush, and there should be no defects such as oil, rust and scale. ② Before surfacing, the stacking surface of the surfacing part must be leveled to ensure an even distribution of the cast wc during surfacing. ③ When surfacing, the surface of the surfacing part is preheated by flame to form a very thin molten metal before surfacing. ④ When surfacing with oxygen-acetylene flame, the flame must maintain a slight excess of acetylene, oxygen: acetylene: 1:1.3, to protect the surface of the surfacing layer and the surfacing metal from oxidation. ⑤ Select the surfacing nozzle according to the size of the weldment and the degree of heating before surfacing. For example, if the medium-sized roller cone bit is welded, the suitable nozzle is used, the consumption of acetylene is 750 L/h.

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