Welding Thermo Cycle and HAZ Softening of CT80 Butt Weld Joint

Abstract:

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The domestic manufactured CT80, Φ33×3.18 coiled tubing is supplied as heat-treated low-alloy steel. The relationship between thermo cycle, microstructure, tensile properties and hardness were researched for butt welded joint. The results show that CT80 is very sensitive to welding heat input, and the thermo accumulation was obvious for small dimension coiled tubing, varying degrees of softening always exist in HAZ. The reasons include growing of block ferrite, decreasing and isolating of continuous directional bainite. In order to get good properties, the strength of consumable welding wire should be properly matched with base metal, keep uniform strength distribution along welded joint, and avoid the plastic strain concentrate in local area.

Info:

Periodical:

Advanced Materials Research (Volumes 295-297)

Edited by:

Pengcheng Wang, Liqun Ai, Yungang Li, Xiaoming Sang and Jinglong Bu

Pages:

1901-1904

DOI:

10.4028/www.scientific.net/AMR.295-297.1901

Citation:

X. Li et al., "Welding Thermo Cycle and HAZ Softening of CT80 Butt Weld Joint", Advanced Materials Research, Vols. 295-297, pp. 1901-1904, 2011

Online since:

July 2011

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Price:

$35.00

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