Comparison of Microstructure and Mechanical Properties Between Laser Welding and TIG Welding of GH536 Alloy

Bin TENG; Shijian PAN; Bao JIANG; Linlin LI; Pengbo WU; Ruisheng HUANG

doi:10.7512/j.issn.1001-2303.2022.05.15

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Comparison of Microstructure and Mechanical Properties Between Laser Welding and TIG Welding of GH536 Alloy
Vol. 52, Issue 5, Pages: 106-111(2022)
DOI： 10.7512/j.issn.1001-2303.2022.05.15

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滕彬，潘士建，蒋宝，等.GH536合金激光焊与钨极氩弧焊接头组织性能对比研究［J］.电焊机，2022，52（5）：106-111.

TENG Bin, PAN Shijian, JIANG Bao, et al.Comparison of Microstructure and Mechanical Properties BetweenLaser Welding and TIG Welding of GH536 Alloy[J].Electric Welding Machine, 2022, 52(5): 106-111.
滕彬，潘士建，蒋宝，等.GH536合金激光焊与钨极氩弧焊接头组织性能对比研究［J］.电焊机，2022，52（5）：106-111. DOI： 10.7512/j.issn.1001-2303.2022.05.15.

TENG Bin, PAN Shijian, JIANG Bao, et al.Comparison of Microstructure and Mechanical Properties BetweenLaser Welding and TIG Welding of GH536 Alloy[J].Electric Welding Machine, 2022, 52(5): 106-111. DOI： 10.7512/j.issn.1001-2303.2022.05.15.

摘要

为探讨激光焊替代氩弧焊焊接GH536合金的可行性，以3 mm厚GH536合金为研究对象，分别采用激光焊和钨极氩弧焊，对比分析两种接头的室温和高温拉伸性能、持久性能、疲劳性能及组织。结果表明：采用激光焊接可以实现3 mm厚GH536合金的单面焊双面成形，相比氩弧焊的双面填丝焊接成形，激光焊在降低热输入的同时焊接速度提高了5倍；激光焊接头室温和1 000 ℃高温平均抗拉强度分别为740 MPa和77 MPa，接头持久寿命可达母材的75%，与氩弧焊接头相当，但相同条件下激光焊接接头的疲劳性能更好，是氩弧焊接头的2倍以上，其主要原因是激光焊单位时间热输入较低，接头组织更均匀，晶粒更细小，焊缝成形平整、光滑，焊趾处应力集中小。通过对比分析可知，激光焊可以替代氩弧焊对GH536合金进行焊接。

Abstract

In order to discuss the feasibility of the laser welding replacing the TIG welding, a 3mm thick GH536 superalloy was welded by these two welding methods. The microstructure, room and high temperature tensile properties, endurance properties and fatigue properties of these two kinds of joints were compared and analyzed. The results show that the one side welding both sides forming of a 3mm thick GH536 alloy can be achieved by laser welding. The laser welding can not only reduce the heat input but also increase the welding speed by five times compared with that of the TIG welding. The average tensile strengths of laser welded joints at room temperature and 1 000 ℃ is 740 MPa and 77 MPa, respectively. The endurance life of the two joints are similar, and can reach 75% of the base metal. However, the fatigue performance of the laser welded joint is better under the same condition, and the fatigue cycle time of the laser welded joint is more than twice than that of the TIG welded joint. Because of the lower heat input, the microstructure of the laser welded joint is more uniform and the grain is finer, which are the main reasons for the better fatigue property. It is indicated that the laser welding can replace the TIG welding for the 3 mm GH536 superalloy.

关键词

GH536合金激光焊接钨极氩弧双面填丝焊力学性能金相组织

Keywords

GH536 alloylaser weldingTIG double-sided wire filling weldingmechanical propertyMetallographic structure

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