Optimization of underwater welding process in stationary local dry cavity and analysis of welding joint properties

ZHANG Shuaifeng<sup>1</sup>, CHENG Fangjie<sup>1,2</sup>, WANG Dongpo<sup>1,2</sup>, GUO Hongwei<sup>3</sup>, XU Wei<sup>3</sup>

doi:10.12073/j.hjxb.2018390232

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2018 > 39(9): 99-104. > DOI: 10.12073/j.hjxb.2018390232

ZHANG Shuaifeng¹, CHENG Fangjie^1,2, WANG Dongpo^1,2, GUO Hongwei³, XU Wei³. Optimization of underwater welding process in stationary local dry cavity and analysis of welding joint properties[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(9): 99-104. DOI: 10.12073/j.hjxb.2018390232

Citation:

Optimization of underwater welding process in stationary local dry cavity and analysis of welding joint properties

ZHANG Shuaifeng¹, CHENG Fangjie^1,2, WANG Dongpo^1,2, GUO Hongwei³, XU Wei³

1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;
2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;
3. China Offshore Oil Engineering Co., Ltd., Tianjin 300451, China

More Information

Received Date: July 09, 2015

Graphical Abstract

Abstract

Abstract

The droplet transfer of flux cored arc welding at normal pressure was investigated with high-speed digital camera system. Based on the experiments under 0.2 MPa pressure in hyperbaric chamber, the welding parameters were optimized. The voltage decrease of cable was compensated. The final current and voltage setting values of the welding machine used for the practical test in Bohai Sea were 175~185 A and 32~34 V, respectively. The test in stationary local dry cavity was carried out at the water depth of 23 m in Bohai Sea. According to AWS D3.6M:2010, the mechanical properties tests were taken. Results indicated that no pores, inclusions and cracks were founded in the welding joints. The microstructures of the weld metals were mainly consisted of acicular-ferrite, ferrite-side-plate and polygonal-ferrite. All the tested mechanical properties reached the requirements of Class A Weld according to the standard. The experimental results indicated that local dry underwater welding based on the stationary drainage cavity can be applied in the repair of DH36 offshore jacket structures.
- underwater welding,
- local dry,
- hyperbaric chamber,
- microstructures

FullText(HTML)

References (9)

References

程方杰, 胡生辉, 高文斌, 等. 水下焊条电弧焊扩散氢含量及焊缝组织特征分析[J]. 焊接学报, 2012, 33(9):45-48 Cheng Fangjie, Hu Shenghui, Gao Wenbin, et al. Diffusible hydrogen content and microstructure characteristic in the joint by underwater shielded metal arc welding[J]. Transactions of the China Welding Institution, 2012, 33(9):45-48

Gao Hui, Jiao Xiangdong, Zhou Chanfeng, et al. Study on remote control underwater welding technology applied in nuclear power station[J]. Procedia Engineering, 2011, 15:4988-4993. doi: 10.1016/j.proeng.2011.08.927

Rowe M, Liu S. Recent developments in underwater wet welding[J]. Science & Technology of Welding & Joining, 2001, 6(6):387-395.

Łabanowski Jerzy. Development of underwater welding techniques[J]. Welding International, 2011, 25(12):933-937

李凯, 高洪明, 李海超, 等. 环境压力对高压干法GMAW熔滴过渡影响分析[J]. 焊接学报, 2014, 35(7):96-100 Li Kai, Gao Hongming, Li Haichao, et al. Effect of ambient pressure on droplet transfer in hyperbaric GMAW[J]. Transactions of the China Welding Institution, 2014, 35(7):96-100

蒋力培, 王中辉, 焦向东, 等. 水下焊接高压空气环境下GTAW电弧特性[J]. 焊接学报, 2007, 28(6):1-4 Jiang Lipei, Wang Zhonghui, Jiao Xiangdong, et al. Characteristics of GTAW arc in underwater welding under high-pressure air condition[J]. Transactions of the China Welding Institution, 2007, 28(6):1-4, doi: 10.3321/j.issn:0253-360X.2007.06.001

李桓, 曹文山, 陈邦固, 等. 气保护药芯焊丝熔滴过渡的形式及特点[J]. 焊接学报, 2000, 21(1):13-16 Li Huan, Cao Wenshan, Chen Banggu, et al. Metal transfer of gas shielded flux-cored wire and its characteristics[J]. Transactions of the China Welding Institution, 2000, 21(1):13-16, doi: 10.3321/j.issn:0253-360X.2000.01.006

Grong Øystein, Leiv Kolbeinsen, Casper Van Der Eijk, et al. Microstructure control of steels through dispersoid metallurgy using novel grain refining alloys[J]. ISIJ International, 2006, 46(6):824-831. doi: 10.2355/isijinternational.46.824

North T H, Bell H B, Koukabi A, et al. Notch toughness of low oxygen content submerged arc deposits[J]. Welding Joumal, 1979, 58(12):343s -354s.

Cited By

Get Citation

XML

Article views (503) PDF downloads (160)

Turn off MathJax

Article Contents

Abstract

References

Optimization of underwater welding process in stationary local dry cavity and analysis of welding joint properties

Abstract

References

Catalog

Export File

Citation

Format

Content