摘要
研究了光纤激光-MIG复合焊接中厚板铝合金的焊缝组织。结果表明,光纤激光-MIG复合焊接可一次焊透8 mm厚铸造铝合金ZL114,焊缝中没有大的工艺气孔,也无热裂纹,但出现较多的冶金气孔。焊缝主要由α(Al)和Al-Si共晶组成,焊缝上部、中部和下部组织变化不明显,焊缝没有分层现象。焊缝较热影响区和母材组织细密,焊缝和热影响区的共晶组织类似,但焊缝和母材共晶组织明显不同,体现在共晶形态和Si含量的不同,但母材的共晶组织在一定的热循环条件下,可以转变为与焊缝类似的共晶组织,伴随的是枝晶数量的减少,枝晶在母材和焊缝中都占绝大部分。
Bead microstructure was investigated medium thickness aluminum alloy with fiber laser-MIG hybrid welding,the results showed that fiber laser-MIG hybrid welding could penetrate 8mm foundry aluminum alloy ZL114 by one scan and there were no big process porosity,nor hot cracking,but many metallurgical porosities in the bead.The bead mainly comprised α （Al）and Al-Si eutectic, the microstructure was similar through upper,medium and bottom parts,no stratification was confirmed.The microstructure was smaller than that of heat affected zone （HAZ） and the eutectic between them was similar though it was obviously different between base material and bead reflected in the differences of eutectic profiles and Si content,but the eutectic in base material could transfer into eutectic similar to that in the bead by special heat recycle with the reduction of dendrite quantity while dendrite still domain the base material and the bead microstructure.
出处
《电焊机》
北大核心
2010年第11期42-46,56,共6页
Electric Welding Machine
