【摘要】：采用氬氣保護(hù)的低頻脈沖變極性氬弧焊(LPVPTIG)、氦氣保護(hù)的直流氬弧焊(DCTIG)和氬氣保護(hù)的高頻脈沖變極性氬弧焊(HPVPTIG)等焊接方法獲得了3種不同的焊縫。結(jié)果表明:由于熱輸入的波動(dòng),LPVPTIG焊縫存在宏觀偏析帶,帶內(nèi)聚集了粗大的共晶和顯微氣孔;DCTIG和HPVPTIG焊縫僅存在微觀偏析,但由于焊接速度較慢,HPVPTIG焊縫Cu元素微觀偏析程度低于DCTIG焊縫。力學(xué)性能測(cè)試結(jié)果表明:焊縫的力學(xué)性能隨著Cu元素和氣孔偏析程度的增加而降低,LPVPTIG焊縫由于存在宏觀偏析帶,其縱向拉伸力學(xué)性能低于橫向拉伸力學(xué)性能。
[Abstract]:Three different welds were obtained by using argon shielded low frequency pulse variable polarity argon arc welding (LPVPTIG), Helium shielded DC argon arc welding (DCTIG) and argon shielded high frequency pulse variable polar argon arc welding (HPVPTIG). The results show that due to the fluctuation of heat input, there is a macrosegregation zone in the weld of LPVPTIG, and coarse eutectic and micropores are accumulated in the weld. There is only microsegregation in DCTIG and HPVPTIG welds, but because of the slow welding speed, the microsegregation degree of Cu elements in HPVPTIG welds is lower than that in DCTIG welds. The results of mechanical properties test show that the mechanical properties of LPVPTIG weld decrease with the increase of Cu element and porosity segregation degree. The longitudinal tensile mechanical properties of LPVPTIG weld are lower than those of transverse drawing because of the existence of macrosegregation zone.
【作者單位】： 清華大學(xué)機(jī)械工程系;首都航天機(jī)械公司;清華大學(xué)摩擦學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;清華大學(xué)先進(jìn)成形制造教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)運(yùn)載火箭技術(shù)研究院;北京航空航天大學(xué)機(jī)械工程及自動(dòng)化學(xué)院;北京宇航系統(tǒng)工程研究所;
【分類(lèi)號(hào)】：TG457.14

【參考文獻(xiàn)】

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1 李權(quán);吳愛(ài)萍;趙s，

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