提高装甲车辆T型焊接接头疲劳寿命的措施研究  

MEASURES TO IMPROVE THE FATIGUE LIFETIME OF WELDED TEE JOINTS IN ARMORED VEHICLES

作　　者：谭伟[1] 张骅[2] 韩文政[1] 徐滨士[1] 胡勇[1] 

机构地区：[1]装甲兵工程学院 [2]北京北方车辆集团有限公司工艺研究所

出　　处：《兵工学报》2003年第4期540-543,共4页Acta Armamentarii

摘　　要：本文对转炉 6 16装甲钢T型焊接接头四点弯曲低周疲劳试验结果进行了分析、研究 ,阐述了提高T型焊接接头低周疲劳寿命的有效措施。研究表明 :焊趾砂轮打磨能够改善焊缝与热影响区(HAZ)过渡部位形状 ,增大过渡圆弧半径 ,并且能去除焊趾处咬边、夹渣等焊接缺陷 ,降低了应力集中 ,从而提高疲劳寿命 ;钨极氩弧焊 (TIG)修整虽能改善焊缝形状 ,但弧坑处易于产生裂纹 ,疲劳寿命降低 ;自制钛酸型TWE312不锈钢焊条的抗裂性和工艺性能较A14 7碱性焊条好 ,其焊接接头的疲劳寿命有一定的提高。疲劳裂纹起裂位于热影响区半熔化区和焊缝不完全混合区 ,并向基体扩展 ,与实际装甲车辆裂纹的萌生部位及扩展途径相一致。Four points bending low-cycle fatigue lifetime of armor steel 616 Tee joints after weld finishing has been analyzed and measures to improve the fatigue lifetime have been proposed in the paper. The results show that grinding the weld toe of the Tee joint will modify the weld toe appearance, wipe off weld defects such as undercut and slag inclusion, relief stress and lengthen the fatigue lifetime of the welded joints; where as TIG dressing can result in crater cracks and therefore shorten the fatigue lifetime. The fatigue crack initiates either in the partial melting zone of HAZ or incomplete mixing zone and propagates into the substrate, similar to crack initiation and propagation in armored vehicles.

关 键 词：装甲车辆 T型焊接 接头 疲劳寿命 低周疲劳 焊接材料 

分 类 号：TJ811[兵器科学与技术—武器系统与运用工程]