细晶TP347H焊材选用及焊接规范研究  

Research on Welding Consumables Selection and Process Specifications for Fine-Grained TP347H Steel

作　　者：张永光 银润邦 钟正彬 ZHANG Yongguang;YIN Runbang;ZHONG Zhengbin(Dongfang Boiler Co.,Ltd.,Zigong 643001,China)

机构地区：[1]东方电气集团东方锅炉股份有限公司,四川自贡643001

出　　处：《电焊机》2025年第3期110-116,121,共8页Electric Welding Machine

摘　　要：针对细晶奥氏体不锈钢TP347HFG的焊接材料选用及接头性能优化问题,本研究通过分析其高温许用应力、抗氧化性能及结构应用条件,明确了氩弧焊焊丝选型原则。结果表明:THERMANIT 304HCu与ERNiCr-3焊丝可匹配TP347HFG的高温性能需求;当设计按普通TP347H许用应力计算时,允许选用ER347焊丝;膜式壁管屏结构需避免使用ERNiCr-3焊丝以防止界面开裂。通过焊接试验与微观组织分析,发现焊接线能量增加会显著扩大热影响区粗晶区宽度,进而降低接头高温抗氧化性能。基于力学性能与金相表征结果,提出焊接线能量宜控制在8 kJ/cm以内,以确保接头高温强度与抗氧化性能满足工程要求。研究结果为超临界锅炉关键部件的焊接工艺制定提供了理论依据。To address the selection of welding materials and optimization of joint performance for fine-grained austenitic stainless steel TP347HFG,this study establishes gas tungsten arc welding(GTAW)filler metal selection criteria through analyzing high-temperature allowable stress,oxidation resistance,and structural application conditions.Results show that THERMANIT 304HCu and ERNiCr-3 wires meet the high-temperature performance requirements of TP347HFG.ER347 wire is permissible when the design adopts the allowable stress of conventional TP347H.ERNiCr-3 should be avoided in membrane wall panels to prevent interfacial cracking.Welding experiments and microstructural characterization reveal that increased welding heat input significantly widens the coarse-grained zone in the heat-affected area,thereby degrading hightemperature oxidation resistance.Mechanical tests and metallographic analysis propose limiting welding heat input within 8 kJ/cm to ensure joint strength and oxidation resistance.This research provides a theoretical foundation for welding process design of critical components in supercritical boilers.

关 键 词：TP347HFG 焊接材料 焊接线能量 热影响区 高温性能 

分 类 号：TG422[金属学及工艺—焊接]