Study on the hardness of GMAW welding joint of underwater tree

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Study on the hardness of GMAW welding joint of underwater tree
Vol. 48, Issue 11, Pages: 60-62(2018)
Published：2018
DOI：
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DOI：

Study on the hardness of GMAW welding joint of underwater tree[J]. Eletric Welding Machine2018, 48(11): 60-62. DOI：

摘要

水下采油树是海洋水油气开发的关键装备

其复杂的结构造成焊接拘束度大

焊接应力也会大幅加大。焊接结构、工艺及坡口的设计都会影响焊接质量

其中水下采油树的焊接接头硬度问题一直是采油树焊接关注的重点。在此主要研究了采油树常用材料SA-516Gr.70

GMAW焊接条件下

不同线能量以及不同焊后热处理焊接接头的硬度变化。通过实验寻找出最佳焊接工艺参数及焊后热处理温度

保证焊接质量。

Abstract

Underwater oil tree is the key equipment for marine water and oil development. Due to the long-term blockade of the design and manufacturing technology of offshore oil and gas exploration equipment in the United States

the design

manufacture and testing of marine trees depend entirely on foreign countries. The complex structure of the tree causes a large degree of welding restraint and a large increase in welding stress. The welding structure

the process

and the design of the welding groove will affect the welding quality. The hardness of welded joint of underwater oil tree has always been the focus of attention.In this paper

the hardness changes of the used materials sa-516 gr.70

GMAW welding conditions

different line energy and different welding joints of the welding joints are studied. The optimum welding parameters and heat treatment temperature were found by experiment.