摘要
针对铝及铝合金MIG焊接过程中容易产生气孔的情况,分析了产生气孔的原因。这些气孔主要是氢气孔。分析了氢的来源,包括母材和焊丝表面的油污、水分及碳氢化合物,焊丝原材料中的氢,施焊环境中的氢。在焊接工艺方面采用亚射流过渡形式,采用合适的焊接速度、焊丝伸出长度、焊枪角度、气体流量、预热温度和层间温度,采用摩擦系数小的特氟龙送丝软管,可以有效的预防和减少铝及铝合金MIG焊接过程中产生的气孔。
For the case of aluminum and aluminum alloy being easy to produce porosity in the MIG welding process, the reason of producing porosity is analyzed, these porosity being primarily hydrogen vent. The source of hydrogen includes water, oil and hydro- carbon on the surfaces of base metal and welding wire, the hydrogen in the raw materials of welding wire, the hydrogen in the weld- ing environment; by using the jet transition form, by using appropriate welding speed, stick-out, welding torch angle, gas flow rate, preheat temperature and the temperature between the layers and by using small friction coefficient of teflon wire feeding tube, the porosity producing in the aluminum and aluminum alloy MIG welding process can effectively prevented and reduced.
出处
《机械制造文摘(焊接分册)》
2011年第5期35-39,共5页
Welding Digest of Machinery Manufacturing
关键词
铝及铝合金焊丝
气孔
焊接工艺
送丝稳定性
aluminum and aluminum alloy welding wire
porosity
welding procedure
wire feed stability