CAJ | 학술논문

介绍了一种新的动态控制等离子焊接工艺.该工艺能够在保持完全焊透的情况下减少对被焊材料的热输入.利用该工艺对Ti-6Al-4V合金实施平板对焊.利用光学显微镜、扫描电镜(SEM)和显微硬度计对焊接接头的显微组织、断口形貌和显微硬度进行表征.与钨极电弧焊接和常规的等离子焊接相比较,使用本工艺提高了焊接质量,其原因在于:1）由于热输入的减少,焊缝中先析出的β相晶粒大幅度减少,从而使马氏体的形成得到抑制；2)焊接接头具有更好的韧性和更高的硬度.
개소료일충신적동태공제등리자한접공예.해공예능구재보지완전한투적정황하감소대피한재료적열수입.이용해공예대Ti-6Al-4V합금실시평판대한.이용광학현미경、소묘전경(SEM)화현미경도계대한접접두적현미조직、단구형모화현미경도진행표정.여오겁전호한접화상규적등리자한접상비교,사용본공예제고료한접질량,기원인재우:1）유우열수입적감소,한봉중선석출적β상정립대폭도감소,종이사마씨체적형성득도억제；2)한접접두구유경호적인성화경고적경도.
A novel dynamically controlled plasma arc welding process was introduced,which is able to minimize heat input into the workpiece materials while maintaining desired full penetration,and it was used to weld Ti-6Al-4V alloy sheets.The microstructures,facture surfaces and microhardness of the welded joints were characterized by using optical microscope,scanning electron microscope (SEM) and Vickers microhardness tester.Comparing with welds such as gas tungsten arc and conventional plasma arc processes,the experimental results revealed the improvements when using the present process including:1) reducing prior-beta (β)grain size and prohibiting formation of hard martensite phases in the fusion zone due to the decreased heat input; and 2) better toughness and higher hardness.