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首页> 外文期刊>Materials and Manufacturing Processes >HARDFACING OF WEAR-RESISTANT DEPOSITS BY MAG WELDING WITH A FLUX-CORED WIRE HAVING GRAPHITE IN ITS FILLING
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HARDFACING OF WEAR-RESISTANT DEPOSITS BY MAG WELDING WITH A FLUX-CORED WIRE HAVING GRAPHITE IN ITS FILLING

机译：石墨填充石墨丝的药芯焊丝堆焊耐磨堆焊。

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A high carbon content in a ledeburite-martensite deposit provides high wear resistance. This can he accomplished in hardfacing by MAG welding with covered electrodes, alloying fluxes, and flux-cored wires. Hardfacing with covered electrodes is not efficient, whereas application of alloying fluxes is suitable only for the flat welding position. Hardfacing by flux-cored MAG welding, however, is efficient and suitable also for out-of-position welding, i.e., in the horizontal-vertical and overhead positions, which is particularly important in maintenance. The paper deals with the investigations of the influence of hardfacing-weld alloying by means of the cored-wire filling in hardfacing both by CO_2 welding and welding with no externally supplied shielding medium. The efficiency of alloying the hardfacing weld depended on the composition and the filling ratio of the wire. In hardfacing of miartensite-ledeburite deposits, the high carbon content in the deposit was provided by the addition of graphite to the cored-wire filling. A result of the high graphite content in the filling was a reduction of the filling ratio of the wire, and, consequently, weaker alloying of the hardfcaing weld. As little as 10wt. percent graphite in the wire fitting substantially affects alloying of the hardfacing weld. In this case, the amount of carbide-forming elements in the hardfacing weld will be reduced by around 4wt. percent whereas the carbon content will increase by as little as 1 percent, which, however, is enough to obtain high-quality martensite-ledeburite wear-resistant deposits with S-BC3 cored wires and with mo externally supplied shielding medium of which the chemical composition, structure, and wear resistance were quite comparable to those obtained with a CrWC 600 covered wire (produced by SZ-Elektrode, Jesenice). Advantages of the cored wire over the covered electrode are substantially higher performance and lower consumption of the electric current.
机译：锂锰矿-马氏体矿床中的高碳含量可提供高耐磨性。这可以通过用覆盖电极，合金焊剂和药芯焊丝进行MAG焊接进行表面堆焊来完成。带有覆盖电极的表面堆焊效率不高，而施加合金焊剂仅适用于扁平焊接位置。然而，通过药芯焊丝MAG焊接进行的堆焊是有效的，并且还适合于非位置焊接，即，在水平-垂直和顶部位置，这在维护中特别重要。本文研究了通过药芯焊丝填充CO_2焊接和不使用外部屏蔽介质进行焊接而对堆焊堆焊合金化的影响。堆焊堆焊合金化的效率取决于焊丝的成分和填充率。在miartensite-ledeburite沉积物的堆焊中，通过在芯线填充物中添加石墨，使沉积物中的碳含量高。填充物中较高的石墨含量的结果是降低了焊丝的填充率，因此导致了堆焊焊缝的合金化较弱。低至10wt。焊丝中石墨的百分含量会严重影响堆焊焊缝的合金化。在这种情况下，堆焊焊缝中碳化物形成元素的数量将减少约4wt％。 ％，而碳含量将仅增加1％，但这足以获得高质量的马氏体-勒氏体耐磨沉积物，该沉积物具有S-BC3芯线以及具有化学成分的外部供应的屏蔽介质，结构和耐磨性与用CrWC 600包覆线（由Jesenice的SZ-Elektrode生产）所获得的相当。芯线在被覆电极上的优点是实质上更高的性能和更低的电流消耗。

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