高頻脈沖電流耦合交流CMT焊對2060鋁合金接頭組織與力學(xué)性能的影響
發(fā)布時間:2019-05-14 01:37
【摘要】:采用不同頻率的高頻脈沖電流耦合交流CMT(cold metal transfer)焊,分別以ER4043及ER5356焊絲為填充材料,對2060鋁鋰合金進行焊接。結(jié)果表明,不同頻率的高頻脈沖電流對焊接接頭的氣孔數(shù)量及大小影響顯著。耦合高頻電流焊接后,焊縫中心的氣孔數(shù)量減少,氣孔大都集中在熔合線及焊縫邊緣;與填充ER4043焊絲相比,填充ER5356焊絲的氣孔數(shù)量少,尺寸也較小。不同的脈沖頻率均能不同程度地細(xì)化顯微組織,填充焊絲為ER4043,脈沖頻率為40 k Hz時,組織細(xì)化現(xiàn)象顯著,接頭各區(qū)的硬度較高;填充焊絲為ER5356,脈沖頻率為60、70 k Hz時,組織細(xì)化現(xiàn)象顯著,接頭各區(qū)的硬度較高。
[Abstract]:2060 Al-Li alloy was welded by high frequency pulse current coupling AC CMT (cold metal transfer) welding with ER4043 and ER5356 wires as filling materials. The results show that the number and size of pores in welded joints are significantly affected by high frequency pulse current at different frequencies. After coupling high frequency current welding, the number of pores in the center of the weld decreases, and most of the pores are concentrated in the fusion line and the edge of the weld. Compared with the filled ER4043 wire, the number and size of the pores filled with the ER5356 wire are also smaller. Different pulse frequencies can refine the microstructure in different degrees. When the pulse frequency of ER4043, is 40 k Hz, the microstructure refinement phenomenon is remarkable, and the hardness of the joint is higher. When the ER5356, pulse frequency is 60 and 70 k Hz, the microstructure refinement is obvious and the hardness of the joint is high.
【作者單位】: 河北科技大學(xué)材料科學(xué)與工程學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(51205106) 河北省自然科學(xué)基金項目(E2016208077)
【分類號】:TG407
本文編號:2476340
[Abstract]:2060 Al-Li alloy was welded by high frequency pulse current coupling AC CMT (cold metal transfer) welding with ER4043 and ER5356 wires as filling materials. The results show that the number and size of pores in welded joints are significantly affected by high frequency pulse current at different frequencies. After coupling high frequency current welding, the number of pores in the center of the weld decreases, and most of the pores are concentrated in the fusion line and the edge of the weld. Compared with the filled ER4043 wire, the number and size of the pores filled with the ER5356 wire are also smaller. Different pulse frequencies can refine the microstructure in different degrees. When the pulse frequency of ER4043, is 40 k Hz, the microstructure refinement phenomenon is remarkable, and the hardness of the joint is higher. When the ER5356, pulse frequency is 60 and 70 k Hz, the microstructure refinement is obvious and the hardness of the joint is high.
【作者單位】: 河北科技大學(xué)材料科學(xué)與工程學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(51205106) 河北省自然科學(xué)基金項目(E2016208077)
【分類號】:TG407
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