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

ZHANG Yongguang; YIN Runbang; ZHONG Zhengbin

doi:10.7512/j.issn.1001-2303.2025.03.15

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Research on Welding Consumables Selection and Process Specifications for Fine-Grained TP347H Steel
Vol. 55, Issue 3, Pages: 110-116(2025)
Received：04 July 2024，

Revised：2024-09-21，

Published：20 March 2025
DOI： 10.7512/j.issn.1001-2303.2025.03.15
稿件说明：

移动端阅览

张永光，银润邦，钟正彬.细晶TP347H焊材选用及焊接规范研究［J］.电焊机，2025，55（3）：110-116. DOI： 10.7512/j.issn.1001-2303.2025.03.15.

ZHANG Yongguang, YIN Runbang, ZHONG Zhengbin.Research on Welding Consumables Selection and Process Specifications for Fine-Grained TP347H Steel[J].Electric Welding Machine, 2025, 55(3): 110-116. DOI： 10.7512/j.issn.1001-2303.2025.03.15.

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。

Abstract

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 high-temperature 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

Keywords

references

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