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几年来我厂在铸铁件焊修方面,从热焊发展到冷焊,从非加工面发展到加工面,从一般缺陷焊补发展到拖拉机壳体类零件难度较大部位的焊补,基本上满足了技术要求,焊缝与母材的硬度,加工性能和色泽基本一致,可进行钻孔、攻丝、车、铣、刨、镗等机械加工。同时,也大大提高了工效,改善了劳动条件。现在将我厂用加热减应法气冷焊铸铁壳体工艺介绍如下。一、加热减应原理金属受热体积要膨胀,冷却时要收缩,加热减应法就是利用此规律,控制焊补过程形成的热应力,
Over the past few years I plant in the cast iron welding repair, the development from the hot welding to cold welding, from the non-processing side to the processing of surface development, welding defects from the general development to the tractor shell parts more difficult parts welding, basically Meet the technical requirements, the hardness of the weld and base metal, processing performance and color are basically the same, can be drilling, tapping, car, milling, planing, boring and other machining. At the same time, it has also greatly improved work efficiency and improved working conditions. Now I plant with heat reduction method of gas-cooled cast iron shell process described below. First, the principle of heating and reducing heat Metal to be expanded by the heating volume, to shrink when cooling, heating reduction method is to use this law to control the thermal stress formed during the welding repair process,