Strengthening and Toughening Mechanism of Weld Metals on GMAW-P of High Strength and High Toughness Welding Wire

doi:10.3901/JME.2024.04.326

Abstract

Abstract: The 10Ni5CrMoV steel plate is welded with pulsed GMAW process using new high strength and high toughness steel welding wire, and the microstructure, mechanical property, strengthening and toughening mechanism of weld metals are analyzed.The results showed that the microstructure of weld metals are lath bainite, granular bainite, acicular ferrite and fine grain ferrite. The high-density dislocations in bainite improved the strength of weld metals. A small amount of M-A constituent in the weld metal is dispersed on the ferrite matrix and hindered the crack propagation, which improves the strength and toughness of the weld metal to a certain extent, but its strengthening effect is limited. A small amount of nonmetallic inclusion in weld metals could refine grains and promote the formation of acicular ferrite, which could improve the strength and toughness of weld metals and not damage the toughness. The yield strength of weld metals is 793 MPa, the elongation is 17.2%, the KV₂ impact energy at-50 ℃ is 132 J, good mechanical property weld metals are obtained.

Key words: weld metals, strength and toughness, microstructure

CLC Number:

TG444

CUI Guihan, YANG Chunli. Strengthening and Toughening Mechanism of Weld Metals on GMAW-P of High Strength and High Toughness Welding Wire[J]. Journal of Mechanical Engineering, 2024, 60(4): 326-334.

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