不锈钢绞股焊丝MAG横焊堆焊层组织与性能
2021-07-20贾蒙储继君徐锴吕晓春徐玉君郭枭
贾蒙 储继君 徐锴 吕晓春 徐玉君 郭枭



摘要: 为解决不锈钢药芯焊丝在加氢反应器人孔及凸台密封面横焊堆焊时易产生夹渣等焊接缺陷的问题,文中选用规格为1.6 mm的ER309L与ER347L不锈钢绞股焊丝进行了横焊堆焊工艺试验。对于堆焊层组织与性能进行了分析。结果表明,不锈钢绞股焊丝横焊堆焊层组织为奥氏体+δ铁素体双相组织;堆焊层铁素体含量为5 FN,晶间腐蚀试验、侧弯试验及硬度试验结果均符合相应技术指标要求。
关键词: 横焊堆焊; 不锈钢; 绞股焊丝
中图分类号: TG 406
Microstructure and properties of surfacing layer by MAG transverse surfacing with stranded wire for stainless steel
Jia Meng, Chu Jijun, Xu Kai, Lü Xiaochun, Xu Yujun, Guo Xiao
(Harbin Welding Institute Limited Company, Harbin 150028, Heilongjiang, China)
Abstract: In order to solve the problems of slag inclusion and other welding defects easily produced in transverse surfacing manhole and sealing surface of bulge in hydrogenation reactor with fluxcored wire for stainless steel, ER309L and ER347L twisted wires for stainless steel with the specification of 1.6 mm were selected to carry out transverse surfacing process test in this paper. Microstructure and properties of the surfacing layer were analyzed. The results showed that microstructure of the surfacing layer was double phases of austenite and δferrite. The ferrite content of the surfacing layer was 5 FN. Results of intergranular corrosion test, side bending test and hardness test all met the corresponding technical requirements.
Key words: transverse surfacing; stainless steel; stranded wire
0 前言
加氫反应器作为加氢裂化的核心设备,长期工作在高温、高压及腐蚀性环境中。为了保证其服役性能,必须要在加氢反应器零部件内壁堆焊耐蚀层[1-3]。对于加氢反应器人孔及凸台密封面来讲,受零件尺寸及焊接位置的影响,其现有的堆焊工艺为:首先,采用ER309L不锈钢药芯焊丝横焊堆焊厚度为3 mm的过渡层;然后,采用ER347L不锈钢药芯焊丝在过渡层的基础之上堆焊厚度为3.5 mm的复层。由于受到熔池下淌等因素的影响,不锈钢药芯焊丝横焊堆焊层极易产生夹渣缺陷。夹渣的存在增加了产品的返修工时与制造成本。
绞股焊丝作为近几年来新兴起的一种异形结构焊丝,研究者通过理论研究和试验验证已经证明了其具有熔敷效率高、稀释率等特点[4-7]。上述特点使得绞股焊丝在应用到堆焊时具有天然的优势。目前,针对绞股焊丝堆焊的研究均集中在平焊位置,对于不锈钢绞股焊丝横焊位置堆焊的相关试验研究尚未展开。……
