摘要
采用一种简便有效的热裂纹试验方法,在普通刚性焊接夹具上研究了拘束力和拘束距离对2A12T4铝合金焊接热裂倾向的影响.结果表明,保持拘束距离不变,随着拘束力的增加,焊接热裂纹率逐渐减小,当拘束力到达一定值后,热裂纹率趋于稳定;保持拘束力不变,随着拘束距离增加,焊接热裂纹率呈增加趋势.夹具对工件的拘束条件主要是通过影响焊件的回转变形程度和焊缝区金属的冷却收缩速度来影响焊接热裂倾向.
A simple and effective experimental method was adopted to investigate the effects of restraint force and restraint distance on hot cracking tendency during welding of 2A12T4 aluminum alloy on the common rigid welding fixture. Experimental results show that,under the condition of keeping restraint distance unchanged,the rate of hot cracks decreases gradually with increase of restraint force and finally well reaches a stable value when the reatraint force is great enough. Keeping the restraint force unchanged,the rate of hot cracks increases with increase of restraint distance. The influence of restraint condition on tendency of hot cracking through effecting the extent of externally-expanded deformation of weldment and the cooling speed of metals in and around the weld.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2009年第7期69-72,共4页
Transactions of The China Welding Institution
关键词
铝合金
焊接
拘束条件
热裂纹
aluminum alloy
welding
restraint condition
hot cracking
