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蒸汽机车汽缸是用灰口铸铁制造的,体形复杂,重达一吨多,如将焊件在地面上用砖砌成炉子加温,劳动条件很差,且由于四周冷空气的影响,加温不均、冷却太快,很容易产生裂纹,亦会使焊波过硬难以加工。由经验证明,焊接铸铁主要的问题是在于焊前预热和焊后退火,它是决定焊件质量好坏的主要因素。我厂是用地炉加温焊接气缸,炉型示意见图1,炉盖见图2。首先把裂纹处铲成70～90°的坡口,再把坡口周围表面的氧化皮铲光,露出金属。为了便于施焊,尽量把焊口
Steam locomotive cylinder is made of gray cast iron, complex shape, weighing more than one ton, such as the welding parts on the ground brick heating furnace, poor working conditions, and due to the impact of cold air around, heating Uneven, too fast cooling, it is easy to crack, it will make the welding wave hard to process. Experience has proved that the main problems of welded cast iron is preheating and post-weld annealing, it is to determine the quality of weldment quality is the main factor. I plant is heated to the floor with a welded cylinder, furnace diagram shown in Figure 1, the lid shown in Figure 2. First, the crack shovel into 70 ~ 90 ° bevel, and then bevel the surface of the oxide shine, revealing the metal. In order to facilitate welding, try to weld