CAJ | 학술논문

钛合金由于具有高比强度、优越的耐腐蚀性和出色的耐热性等优良特性,已成功应用于航空航天、造船和化学工业.尽管钛合金具有合适的可焊性特点,但焊接方法极大地影响焊接接头性能.焊接过程中热循环将会影响焊接金属凝固、相转变和微观组织.采用钨电极惰性气体保护焊接(GTAW)、激光束焊接(LBW)和电子束焊接(EBW)方法制备Ti-6Al-4V合金的焊接接头.EBW焊接接头的强度高于GTAW和LBW接头的强度,但GTAW接头较其它两种接头具有较高的断裂韧性.焊接接头的拉伸和冲击性能与焊接金属的微观组织有关.
태합금유우구유고비강도、우월적내부식성화출색적내열성등우량특성,이성공응용우항공항천、조선화화학공업.진관태합금구유합괄적가한성특점,단한접방법겁대지영향한접접두성능.한접과정중열순배장회영향한접금속응고、상전변화미관조직.채용오전겁타성기체보호한접(GTAW)、격광속한접(LBW)화전자속한접(EBW)방법제비Ti-6Al-4V합금적한접접두.EBW한접접두적강도고우GTAW화LBW접두적강도,단GTAW접두교기타량충접두구유교고적단렬인성.한접접두적랍신화충격성능여한접금속적미관조직유관.
Titanium alloys have been successfully applied for aerospace,ship and chemical industries because they possess many good characteristics such as high specific strength,superior corrosion resistance and excellent high temperature resistance.Though these alloys show reasonable weldability characteristics,the joint properties are greatly influenced by the welding processes.Weld thermal cycle of the processes will control the weld metal solidification and subsequent phase transformation and resultant microstructure.The welded joints of Ti-6Al-4V alloy were fabricated by gas tungsten arc welding (GTAW),laser beam welding (LBW) and electron beam welding (EBW) processes.The joints fabricated by EBW process exhibit higher strength compared with the GTAW and LBW joints; but the joints by GTAW process exhibit higher impact toughness compared with the LBW and EBW joints.The resultant tensile and impact properties of the welded joints were correlated with the weld metal microstructures.