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来源：百度知道 编辑：UC知道 时间：2024/06/11 21:21:40
铝及其合金由于资源丰富，具有比重小、强度高、表面氧化膜有较强的抗腐蚀性能，被广泛应用各个领域，所以铝合金的焊接技术也在突飞猛进地发展，随之对其性能也提高了要求。若使铝合金焊接接头在使用当中得到优良的力学性能,就得通过焊接工艺试验来选用恰当的焊接参数，通过比较母材和焊缝及热影响区的力学性能和显微组织分析等，得出最佳焊接工艺参数。
本设计以LF6铝合金板材对接交流TIG焊接工艺为研究对象，在相应的工艺试验的基础上，通过焊缝力学性能试验发现，若焊接工艺参数合理，则拉伸后焊件基本都是在热影响区断裂；若焊接工艺参数不合理，焊件则在焊缝处断裂，在其焊缝中有明显的气孔或未焊透存在；通过金相组织分析发现，焊缝及热影响区的组织与母材的组织相差很大，在热影响区都有晶粒长大的迹像，还有一些杂质相的存在，这些都是降低铝合金力学性能的原因，焊缝区的晶粒和晶界会很明显，而且也会出现晶粒明显长大的迹象，所以也会出现断裂的现象。
通过分析，本设计得出LF6铝合金板材对接交流TIG焊较为合理的焊接工艺参数为焊接基值电流90A，脉冲电流170A，脉冲频率2Hz，焊接速度178mm/min，送丝速度0.9m/min，弧高h=4mm。
Aluminum and its alloys is rich in resources, with a small proportion, high intensity, the surface oxide film a strong corrosion resistance and widely used in various fields, so the aluminum alloy welding technology has developed by leaps and bounds, attendant also improve its performance requirements. All the alloy welded joints using them to be excellent mechanical properties, have to pilot through the welding process to choose the appropriate welding parameters By compari

Aluminum and its metal alloy because of resources abundant, have specific weight small, strength Gao, the surface oxidize a film to have a stronger nti- corrosion function, drive extensive application each realm, so the weld of aluminum metal alloy technique be also advance by leaps and bounds ground development, as to it's immediately function also exaltation request.Aluminum metal alloy if weld to deal with contact at usage in the middle get good mechanics function, have to pass to weld a craft experiment to choose to use to fittingly weld parameter, pass more mother material and Han sew and hot influence area of mechanics function with show minute details organization analysis etc., get be the best to weld craft parameter.
This design the LF6 aluminum metal alloy plank is sewn mechanics function to experiment to discover towards connecting exchanges TIG to weld a craft for research object, at correspond of craft experiment of foundation ascend, through a Han by material