With thick plates of 2219 high-strength alloy, the microstructures of welded joints with twin wire MIG welding were analyzed. Experimental results show that no hot crack was found in the weld due to discontinuous dist...With thick plates of 2219 high-strength alloy, the microstructures of welded joints with twin wire MIG welding were analyzed. Experimental results show that no hot crack was found in the weld due to discontinuous distribution of cocrystallization with low melting temperature, but porosity is serious in the first weld seam that is mainly composed of equiaxial grains with uneven sizes. As the poor position of the whole welded joint, fusion zone has big and coarse grains, uneven microstructures ; In quenching zone, there exist a lot of soaked microstructures that cocrystallizntion with low melting temperature solute into matrix, thus strengthening the metal in this zone; In excessive aging zone, much more phases that distribute evenly will be separated from the matrix; Ontside this zone, properties and microstructures of the metal are basically similar to matrix due to the relatively low temperature or unaffected heat in the zone during welding.展开更多
CO2 laser welding aluminum alloy with filler wire was studied. The results indicate that the problems in CO2 laser welding of Al alloy, such as bad appearance of weld, easily excessive penetration and low strength, ca...CO2 laser welding aluminum alloy with filler wire was studied. The results indicate that the problems in CO2 laser welding of Al alloy, such as bad appearance of weld, easily excessive penetration and low strength, can be improved effectively by using laser welding with filler wire, and the maximum tensile strength of weld can reach 94% for the base metal. It also can be found that, the linear energy have great influence on the microstructure and mechanical properties of the joint. As the heat input increases, the cellular fir-tree crystals in the weld zone become sparse and the form of tensile fracture transforms from gliding fracture to brittle fracture.展开更多
在对国内5356焊丝制备工艺现状进行梳理的基础上,拟制了高品质5356焊丝生产工艺方案。根据拟定的生产技术质量要求、生产装备与工艺流程、工艺参数等,利用国产某高端焊丝生产线进行了生产实践。该生产线以Φ2.7 mm 5356线杆为原材料,生...在对国内5356焊丝制备工艺现状进行梳理的基础上,拟制了高品质5356焊丝生产工艺方案。根据拟定的生产技术质量要求、生产装备与工艺流程、工艺参数等,利用国产某高端焊丝生产线进行了生产实践。该生产线以Φ2.7 mm 5356线杆为原材料,生产制造高品质5356铝焊丝生产。通过对生产过程的理论分析,总结了高品质5356铝焊丝的生产关键技术,指出了现有拉丝设备刮削技术存在的不足。展开更多
文摘With thick plates of 2219 high-strength alloy, the microstructures of welded joints with twin wire MIG welding were analyzed. Experimental results show that no hot crack was found in the weld due to discontinuous distribution of cocrystallization with low melting temperature, but porosity is serious in the first weld seam that is mainly composed of equiaxial grains with uneven sizes. As the poor position of the whole welded joint, fusion zone has big and coarse grains, uneven microstructures ; In quenching zone, there exist a lot of soaked microstructures that cocrystallizntion with low melting temperature solute into matrix, thus strengthening the metal in this zone; In excessive aging zone, much more phases that distribute evenly will be separated from the matrix; Ontside this zone, properties and microstructures of the metal are basically similar to matrix due to the relatively low temperature or unaffected heat in the zone during welding.
文摘CO2 laser welding aluminum alloy with filler wire was studied. The results indicate that the problems in CO2 laser welding of Al alloy, such as bad appearance of weld, easily excessive penetration and low strength, can be improved effectively by using laser welding with filler wire, and the maximum tensile strength of weld can reach 94% for the base metal. It also can be found that, the linear energy have great influence on the microstructure and mechanical properties of the joint. As the heat input increases, the cellular fir-tree crystals in the weld zone become sparse and the form of tensile fracture transforms from gliding fracture to brittle fracture.
文摘在对国内5356焊丝制备工艺现状进行梳理的基础上,拟制了高品质5356焊丝生产工艺方案。根据拟定的生产技术质量要求、生产装备与工艺流程、工艺参数等,利用国产某高端焊丝生产线进行了生产实践。该生产线以Φ2.7 mm 5356线杆为原材料,生产制造高品质5356铝焊丝生产。通过对生产过程的理论分析,总结了高品质5356铝焊丝的生产关键技术,指出了现有拉丝设备刮削技术存在的不足。
