Rotating Arc Narrow Gap Vertical Welding Equipment for 9% Ni Steel Large Storage Tanks

YAN Qiangqiang; JIA Chuanbao; CHEN Chonglong; WANG Yinggang; HU Zhiwen; ZHENG Qingye

doi:10.7512/j.issn.1001-2303.2024.03.01

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Rotating Arc Narrow Gap Vertical Welding Equipment for 9% Ni Steel Large Storage Tanks
Vol. 54, Issue 3, Pages: 1-11(2024)
Published： 25 March 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.03.01

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闫强强，贾传宝，陈崇龙，等.面向9%Ni钢大型储罐的旋转电弧窄间隙立焊装备［J］.电焊机，2024，54（3）：1-11.

YAN Qiangqiang, JIA Chuanbao, CHEN Chonglong, et al.Rotating Arc Narrow Gap Vertical Welding Equipment for 9% Ni Steel Large Storage Tanks[J].Electric Welding Machine, 2024, 54(3): 1-11.
闫强强，贾传宝，陈崇龙，等.面向9%Ni钢大型储罐的旋转电弧窄间隙立焊装备［J］.电焊机，2024，54（3）：1-11. DOI： 10.7512/j.issn.1001-2303.2024.03.01.

YAN Qiangqiang, JIA Chuanbao, CHEN Chonglong, et al.Rotating Arc Narrow Gap Vertical Welding Equipment for 9% Ni Steel Large Storage Tanks[J].Electric Welding Machine, 2024, 54(3): 1-11. DOI： 10.7512/j.issn.1001-2303.2024.03.01.

摘要

提出一种面向9%钢大型LNG储罐的旋转电弧窄间隙立焊装备，旨在解决LNG储罐立缝位置的焊接难题。采用窄间隙TIG旋转电弧焊接新工艺，将钨极打磨成非轴对称的尖端，通过电机控制钨极旋转，使电弧周期性加热窄间隙坡口两侧，有效解决了侧壁熔合问题。为配合该工艺，设计了新型窄间隙TIG旋转电弧焊枪，具备无线回转导电、自动送丝和双路气保护功能。同时，提出了一套适用于LNG储罐立缝位置的自动焊接设备，包括真空吸附的挂壁小车和焊接小车。在实验室搭建了全套试验装备，包括焊接小车、全自动送丝机、焊接电源等，控制焊枪立缝位置的焊接行走，防止9%Ni钢磁化，同时保证焊接过程的稳定。对24 mm厚9%Ni钢进行单层单道的焊接试验和窄间隙坡口对接试验，验证了新工艺能够解决厚板窄间隙焊接中侧壁熔合的问题，并且由于电弧循环旋转，对熔池具有搅拌作用，焊缝表面成形平滑美观。该研究为LNG储罐立缝的自动高效焊接提供了技术和装备支持。

Abstract

A rotary arc narrow gap vertical welding equipment for 9% steel large-scale LNG storage tanks is proposed

aiming to solve the welding problems in the position of the vertical seam of LNG storage tanks. The new narrow gap TIG rotary arc welding process is adopted

in which the tungsten electrode is polished into a non-axisymmetric tip

and the tungsten electrode is rotated by motor control

so that the arc heats up both sides of the narrow-gap bevel periodically

which effectively solves the problem of fusion of the side walls. In order to cooperate with this process

a new type of narrow-gap TIG rotary arc welding torch is designed with wireless rotary conductivity

automatic wire feeding and dual path gas protection. At the same time

a set of automatic welding equipment suitable for the position of the vertical seam of LNG storage tanks is proposed

including a wall-mounted trolley and a welding trolley with vacuum adsorption. A full set of test equipment

including welding trolley

fully automatic wire feeder and welding power supply

was built in the laboratory to control the welding travel of the welding torch in the vertical seam position to prevent magnetization of 9%Ni steel

and at the same time to ensure the stability of the welding process. The welding test of 24 mm thick 9%Ni steel with a single layer and a single pass and the narrow gap bevel butt joint test verified that the new process can solve the problem of sidewall fusion in the narrow gap welding of thick plates. And due to the arc cycle rotation

the molten pool has a stirring effect

so that the weld surface shaping is also very smooth and beautiful. This study provides technical and equipment support for automatic and efficient welding of LNG tank vertical seam.

关键词

窄间隙旋转电弧侧壁熔合9%Ni钢立焊自动化焊接

Keywords

narrow gaprotating arcSide wall fusion9%Ni steelvertical weldingautomated welding

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