Friction stir welding of DH36 steel

被引：131

作者：

Reynolds, AP

Tang, W

Posada, M

DeLoach, J

机构：

[1] Univ S Carolina, Dept Mech Engn, Columbia, SC 29208 USA

[2] USN, Ctr Surface Warfare, Carderock Div, Welding & NDE, Bethesda, MD 20817 USA

来源：

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2003年 / 8卷 / 06期

关键词：

D O I：

10.1179/136217103225009125

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hot rolled DH36 carbon steel, 6.4 mm in thickness, Was friction stir welded at speeds of 3.4 mm s(-1) (8 in min(-1)), 5.1 mm s(-1) (12 in min(-1)), and 7.6 mm s(-1) (18 in min(-1)). Single pass welds free of volumetric defects were produced at each speed. The relationships between welding parameters and weld properties are discussed. Optical microscopy, microhardness testing, and transverse and longitudinal tensile tests have been performed. Bainite and martensite are found in the nugget region of the friction stir welds whereas the base material is comprised of ferrite and peat-lite. The maximum hardness is observed in the weld nugget, and the hardness decreases gradually from the weld nugget, through the heat affected Zone, to the base metal. Tensile testing also indicates overmatching of the weld metal relative to the base metal. Maximum hardness and longitudinal (all weld metal) tensile strengths increase with increasing welding speeds. Weld transverse tensile strengths are governed by the base metal properties, as all transverse tensile bars fail in the base metal.

引用

页码：455 / 460

页数：6

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