Research on the nondestructive examination of narrow gap MAG welding of API 5L X65M thermomechanical treated steel

2021 ◽  
Author(s):  
Dinu Simionescu ◽  
Ion Mitelea ◽  
Olimpiu Karancsi ◽  
Ion-Dragoș Utu
Keyword(s):  
Mag Welding ◽  
Narrow Gap ◽  
Nondestructive Examination ◽  
Treated Steel

A Digital Control for Swinging Arc Narrow Gap MAG Welding System

2013 ◽  
Vol 468 ◽  
pp. 127-133
Author(s):  
Jie Zhu ◽  
Wei Qiong Xiong ◽  
Wei Hua Zhang ◽  
Wen Hang Li ◽  
Jia You Wang
Keyword(s):  
Control System ◽  
Digital Control ◽  
Welding Process ◽  
Mag Welding ◽  
Narrow Gap ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Control Functions ◽  
Welding System ◽  
Exchange Data

This paper presents a digital control system for swinging arc narrow gap MAG welding based on double single-chip microcomputers. The control system utilizes a single-chip microcomputer to set and display welding process parameters, and then uses another single-chip microcomputer to realize the control functions that are necessary for the swing arc process, in which the two single-chip microcomputers can exchange data through asynchronous serial communication circuit. Experimental results show that the control system works stably and reliably with strong anti-interference capabilities, and can completely satisfy the requirements of swinging arc narrow gap welding process.

A modified welding image feature extraction algorithm for rotating arc narrow gap MAG welding

2015 ◽  
Vol 42 (3) ◽  
pp. 222-227 ◽  
Author(s):  
Wenhang Li ◽  
Yunhong Ji ◽  
Jing Wu ◽  
Jiayou Wang
Keyword(s):  
Feature Extraction ◽  
Extraction Method ◽  
Image Feature ◽  
Mag Welding ◽  
Narrow Gap ◽  
Image Feature Extraction ◽  
Content Type ◽  
Feature Extraction Method ◽  
Extraction Algorithm ◽  
Welding Image

Purpose The purpose of this paper is to provide a modified welding image feature extraction algorithm for rotating arc narrow gap metal active-gas welding (MAG) welding, which is significant for improving the accuracy and reliability of the welding process. Design/methodology/approach An infrared charge-coupled device (CCD) camera was utilized to obtain the welding image by passive vision. The left/right arc position was used as a triggering signal to capture the image when the arc is approaching left/right sidewall. Comparing with the conventional method, the authors’ sidewall detection method reduces the interference from arc; the median filter removes the welding spatter; and the size of the arc area was verified to reduce the reflection from welding pool. In addition, the frame loss was also considered in the authors’ method. Findings The modified welding image feature extraction method improves the accuracy and reliability of sidewall edge and arc position detection. Practical implications The algorithm can be applied to welding seam tracking and penetration control in rotating or swing arc narrow gap welding. Originality/value The modified welding image feature extraction method is robust to typical interference and, thus, can improve the accuracy and reliability of the detection of sidewall edge and arc position.

Novel rotation arc system for narrow gap MAG welding

2007 ◽  
Vol 12 (6) ◽  
pp. 505-507 ◽  
Author(s):  
J. Y. Wang ◽  
Y. S. Ren ◽  
F. Yang ◽  
H. B. Guo
Keyword(s):  
Mag Welding ◽  
Narrow Gap

Groove sidewall penetration modeling for rotating arc narrow gap MAG welding

2014 ◽  
Vol 78 (1-4) ◽  
pp. 573-581 ◽  
Author(s):  
Wenhang Li ◽  
Kai Gao ◽  
Jing Wu ◽  
Jiayou Wang ◽  
Yunhong Ji
Keyword(s):  
Mag Welding ◽  
Narrow Gap ◽  
Rotating Arc

Research on the “jump sidewall” behavior and its signal characteristics in narrow gap P-MAG welding

2016 ◽  
Vol 91 (1-4) ◽  
pp. 1189-1196 ◽  
Author(s):  
Liu Wenji ◽  
Li Liangyu ◽  
Yue Jianfeng ◽  
Yan Peiyu ◽  
Liu Xiaohui
Keyword(s):  
Mag Welding ◽  
Narrow Gap ◽  
Signal Characteristics

scholarly journals Narrow Gap MAG Welding and Joint Performance Analysis of 25Cr2NiMo1V Thick Plate

2022 ◽  
Vol 2160 (1) ◽  
pp. 012022
Author(s):  
Xiaoyan Qian ◽  
Xin Ye ◽  
Xiaoqi Hou ◽  
Fuxin Wang ◽  
Shaowei Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ductile Fracture ◽  
Impact Energy ◽  
Welded Joint ◽  
Fusion Line ◽  
Coarse Grained ◽  
Mag Welding ◽  
Rotor Steel ◽  
Narrow Gap ◽  
The Impact

Abstract The narrow gap MAG welding system was used to successfully weld the 50mm thick butt joint of 25Cr2NiMo1V rotor steel. After 15-layer bead welding, heat treatment is performed on the welded joint. Compare the changes in the microstructure, tensile strength and impact energy of the welded joints and the heat-treated joints at 580°C (20h). The results show that after the heat treatment of the structure, the side lath ferrite in the coarse-grained region grows up, and the eutectoid ferrite grows up in the fine-grained region first. The strength of the welded joint is about 605MPa, and the fracture is characterized by ductile fracture. After heat treatment at 580°C (20h), the strength is about 543MPa, the fracture is characterized by ductile fracture, and there are also a large number of discontinuous small surface platforms, and the characteristic of brittle fracture appears slightly. The impact energy of the weld center of the welded joint is about 141J, the fusion line area is about 113J, and the toughness of the fusion line is slightly lower than that of the weld center. After heat treatment, the impact energy at the center of the weld is about 183J, the fusion line area is about 95J, the toughness of the weld center increases, and the toughness of the fusion line decreases.

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