低電流TIG電弧輔助高速MIG咬邊缺陷抑制機理及工藝優(yōu)化
發(fā)布時間：2019-04-21 14:44
【摘要】：傳統(tǒng)的M1G焊接工藝以其高適應(yīng)性、易于實現(xiàn)自動化等優(yōu)點,在制造業(yè)中得到廣泛應(yīng)用。在實際焊接過程中,當(dāng)MIG焊焊接速度超過某一臨界值時,焊縫成形中通常會伴有咬邊缺陷,成為制約該工藝在高速焊中的主要障礙。改善高速MIG焊縫成形,研究高速MIG咬邊缺陷的抑制機理,對MIG在高速焊中的應(yīng)用具有重要的研究意義和理論價值。設(shè)計、制作了TIG-MIG復(fù)合焊接雙焊槍加持裝置,優(yōu)化了電參數(shù)采集設(shè)備。完成了溫度場、流場和熔滴過渡檢測等實驗平臺的搭建,用以獲取高速TIG-MIG復(fù)合焊焊接過程中熔池傳質(zhì),傳熱以及受力變化。初步工藝實驗表明低電流TIG輔助電弧可有效抑制高速MIG焊咬邊缺陷。開展了溫度參量和咬邊缺陷的相關(guān)性研究,得出熔池邊緣溫度梯度是影響咬邊缺陷的重要溫度參量。低電流TIG輔助電弧可以有效降低高速MIG焊熔池前部邊緣部位的溫度梯度。此外,熔池流動行為也表明低電流TIG輔助電弧可以促進(jìn)液態(tài)金屬向焊縫邊緣的鋪展和填充,達(dá)到降低熔池邊緣溫度梯度的目的。研究焊接過程中受力變化對焊縫成形的影響,對比各種作用力對咬邊缺陷的影響力度。結(jié)果表明低電流TIG電弧輔助高速焊中,熔滴沖擊力和電弧力是影響咬邊缺陷的主要作用力,重力及表面張力等作用力為次要作用力。通過低電流TIG電弧的輔助可以有效減小電弧力的作用,從而減輕甚至抑制高速MIG焊接過程中咬邊缺陷的產(chǎn)生。在理論研究的基礎(chǔ)上,針對性的開展工藝實驗。獲取復(fù)合焊中各焊接工藝參數(shù)對咬邊缺陷的影響,制定出工藝優(yōu)化的簡易方案,以減少工藝優(yōu)化數(shù)量。優(yōu)化后的復(fù)合焊參數(shù)能完全抑制高速焊咬邊缺陷的產(chǎn)生。
[Abstract]:The traditional M1G welding process has been widely used in manufacturing because of its high adaptability and easy automation. In the actual welding process, when the welding speed of the MIG welding exceeds a certain critical value, there are usually bite defects in the weld forming, which becomes the main obstacle in the process of high-speed welding. It is of great significance and theoretical value to improve the weld forming of high-speed MIG and to study the suppression mechanism of high-speed MIG bite defects. It is of great significance and theoretical value for the application of MIG in high-speed welding. The double welding torch holding device of TIG-MIG composite welding is designed and manufactured, and the electric parameter collecting equipment is optimized. The experimental platform of temperature field, flow field and droplet transfer detection was built to obtain the mass transfer, heat transfer and stress change of molten pool during the welding process of high-speed TIG-MIG composite welding. The preliminary experimental results show that the low current TIG auxiliary arc can effectively restrain the edge-biting defects of high-speed MIG welding. The correlation between temperature parameters and edge-biting defects is studied. It is concluded that the temperature gradient on the edge of molten pool is an important temperature parameter that affects the edge-biting defects. The low current TIG auxiliary arc can effectively reduce the temperature gradient at the front edge of the high-speed MIG welding pool. In addition, the flow behavior of the weld pool shows that the low current TIG auxiliary arc can promote the spreading and filling of liquid metal to the weld edge, so as to reduce the temperature gradient of the weld pool edge. The influence of force change on weld forming during welding is studied, and the influence of various forces on bite defect is compared. The results show that droplet impact force and arc force are the main forces affecting edge-biting defects in low-current TIG arc-assisted high-speed welding, while gravity and surface tension are secondary forces. With the aid of low current TIG arc, the effect of arc force can be reduced effectively, so as to reduce or even restrain the formation of edge-biting defects in high-speed MIG welding. On the basis of theoretical research, the process experiment is carried out. In order to reduce the number of process optimization, the influence of welding process parameters on edge-cutting defects in composite welding was obtained, and the simple scheme of process optimization was worked out in order to reduce the number of process optimization. The optimized composite welding parameters can completely inhibit the formation of edge-biting defects in high-speed welding.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG444.74
本文編號：2462303
[Abstract]:The traditional M1G welding process has been widely used in manufacturing because of its high adaptability and easy automation. In the actual welding process, when the welding speed of the MIG welding exceeds a certain critical value, there are usually bite defects in the weld forming, which becomes the main obstacle in the process of high-speed welding. It is of great significance and theoretical value to improve the weld forming of high-speed MIG and to study the suppression mechanism of high-speed MIG bite defects. It is of great significance and theoretical value for the application of MIG in high-speed welding. The double welding torch holding device of TIG-MIG composite welding is designed and manufactured, and the electric parameter collecting equipment is optimized. The experimental platform of temperature field, flow field and droplet transfer detection was built to obtain the mass transfer, heat transfer and stress change of molten pool during the welding process of high-speed TIG-MIG composite welding. The preliminary experimental results show that the low current TIG auxiliary arc can effectively restrain the edge-biting defects of high-speed MIG welding. The correlation between temperature parameters and edge-biting defects is studied. It is concluded that the temperature gradient on the edge of molten pool is an important temperature parameter that affects the edge-biting defects. The low current TIG auxiliary arc can effectively reduce the temperature gradient at the front edge of the high-speed MIG welding pool. In addition, the flow behavior of the weld pool shows that the low current TIG auxiliary arc can promote the spreading and filling of liquid metal to the weld edge, so as to reduce the temperature gradient of the weld pool edge. The influence of force change on weld forming during welding is studied, and the influence of various forces on bite defect is compared. The results show that droplet impact force and arc force are the main forces affecting edge-biting defects in low-current TIG arc-assisted high-speed welding, while gravity and surface tension are secondary forces. With the aid of low current TIG arc, the effect of arc force can be reduced effectively, so as to reduce or even restrain the formation of edge-biting defects in high-speed MIG welding. On the basis of theoretical research, the process experiment is carried out. In order to reduce the number of process optimization, the influence of welding process parameters on edge-cutting defects in composite welding was obtained, and the simple scheme of process optimization was worked out in order to reduce the number of process optimization. The optimized composite welding parameters can completely inhibit the formation of edge-biting defects in high-speed welding.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG444.74
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