CAJ | 학술논문

介绍了气保护药芯焊丝熔敷金属中组织及形态，分析了熔敷金属组织的影响因素及对焊缝韧性的影响，提出了焊丝熔敷金属组织控制机理。结果表明：该焊丝熔敷金属的组织为大量针状铁素体+少量晶界铁素体+极少量侧板条铁素体。焊缝组织的影响因素中，起决定作用的是熔敷金属化学成分和焊缝的冷却速度。夹杂物尺寸和 Ti、B 加入量的控制是形成针状铁素体的必要条件，而焊接热输入的控制则是充分条件，二者缺一不可。期待研发一种特殊添加剂，能有效获得所需针状铁素体，并使焊缝韧性对焊接热输入不再敏感。
개소료기보호약심한사용부금속중조직급형태，분석료용부금속조직적영향인소급대한봉인성적영향，제출료한사용부금속조직공제궤리。결과표명：해한사용부금속적조직위대량침상철소체+소량정계철소체+겁소량측판조철소체。한봉조직적영향인소중，기결정작용적시용부금속화학성분화한봉적냉각속도。협잡물척촌화 Ti、B 가입량적공제시형성침상철소체적필요조건，이한접열수입적공제칙시충분조건，이자결일불가。기대연발일충특수첨가제，능유효획득소수침상철소체，병사한봉인성대한접열수입불재민감。
The microstructures and morphology in the deposited metal for gas - shielded flux cored wire were introduced and the factors affecting the deposited metal microstructure and effects of microstructure on toughness were analyzed,and the control mechanism of mi-crostructure in deposited metal for gas - shielded flux cored wire was proposed. The results show that the microstructures of wire deposi-ted metal are composed of large number of acicular ferrite and small amount of grain boundary ferrite,and very small amount of ferrite side plate. The chemical compositions and cooling rat of deposited metal are the decisive factors in the ferrite morphology factors. The control of inclusion size and Ti,B add the amount is the necessary condition,while the welding heat input control is sufficient condi-tions,and neither is dispensable. A special additive to achieve the desired acicular ferrite effctively is hoped to develop,this technology is anticipated to result in the less sensitive of the weld metal toughness to welding heat input.