27SiMn钢与35钢焊接工艺

Study on welding technology of 27SiMn steel and 35 steel

液压缸筒由低合金27Si Mn和35钢焊装,由于是异种钢焊接,其焊缝及热影响区容易出现高硬度、高脆性、韧性较低的组织和性能,而焊接是油缸生产制造过程中关键工序之一。选用CO2气体保护焊,精选低氢低碳合金焊材和焊接工艺参数,采用焊前预热、焊后缓冷的焊接工艺。经焊后力学性能试验,各项指标合格;经焊接工艺评定,焊缝成形好,焊缝热影响区小,焊接变形小,无气孔、无裂纹、无未熔合、无未焊透等缺陷,焊接质量优良。结果表明,采用合理的焊接工艺,低合金钢27Si Mn与35钢焊接性能优良,能满足液压油缸的工作要求。

The hydraulic cylinder can be made of low alloy 27SiMn and 35 steel welding, because of dissimilar steel welding, the weld and heat affected zone is prone to the microstrueture and properties of high hardness,high brittleness and low toughness,welding is one of the key cylinder manufacturing processes. In this regard,the selection of CO2 gas shielded arc welding,low hydrogen low carbon alloy welding material and welding parameters by preheating before welding, after welding, eold welding process of corrosion. Through the test of mechanical properties after welding, the qualified index; evaluation of welding process, weld forming and weld heat affected zone is small, small welding deformation, without porosity and cracks, lack of fusion, no welding defects, the welding quality is excellent. The results show that the welding performance of low alloy steel 27SiMn and 35 steel is excellent and can meet the requirement of hydraulic cylinder.