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我厂生产的混凝土输送泵车下部壳体,在易磨损处需堆焊耐磨材料,延长其使用寿命。壳体材料为HT300,含碳量高,给堆焊带来很大困难。为此,我们选择了合适的焊接材料和可行的焊接工艺,解决了堆焊难题。 1 焊接材料 由于母材含碳量高,要防止堆焊作业时出现裂纹,控制焊蚕中的含碳量,可通过控制焊条的化学成分来消除裂纹。实践表明,当焊缝金属的含碳量小于0.15％时,产生裂纹的可能性较小。所以,我们选择含碳量低的焊条,将焊条含碳量控制在0.12％以下。
I plant production of concrete pump truck under the shell, wear-resistant wear-resistant materials to be surfacing, to extend its service life. Shell material HT300, high carbon content, to surfacing bring great difficulties. To this end, we have chosen the right welding materials and feasible welding process, to solve the problem of surfacing. A welding material due to the high carbon content of the parent metal, to prevent the occurrence of cracks in the welding operation, the control of welding silkworm in the carbon content, by controlling the chemical composition of the electrode to eliminate cracks. Practice shows that when the weld metal carbon content is less than 0.15%, the possibility of cracking is less likely. Therefore, we choose a low carbon electrode, the carbon content of the electrode is controlled below 0.12%.