Influence of wire feed rate to speed ratio on arc stability and characteristics of cold metal transfer weld–brazed dissimilar joints

2020 ◽  
Vol 108 (11-12) ◽  
pp. 3491-3505 ◽  
Author(s):  
Jaivindra Singh ◽  
Kanwer Singh Arora ◽  
Nikhil Shajan ◽  
Mahadev Shome ◽  
Dinesh Kumar Shukla
Keyword(s):  
Feed Rate ◽  
Metal Transfer ◽  
Speed Ratio ◽  
Cold Metal Transfer ◽  
Dissimilar Joints ◽  
Arc Stability ◽  
Cold Metal ◽  
Wire Feed

Cold Metal Transfer (CMT) Welding of Dissimilar Materials: An Overview

2019 ◽  
Vol 969 ◽  
pp. 685-690 ◽  
Author(s):  
S. Venukumar ◽  
Muralimohan Cheepu ◽  
T. Vijaya Babu ◽  
D. Venkateswarlu
Keyword(s):  
Dissimilar Materials ◽  
Metal Transfer ◽  
Dissimilar Metals ◽  
Technological Parameters ◽  
Cold Metal Transfer ◽  
Dissimilar Joints ◽  
Continuous Growth ◽  
Welding Method ◽  
Cmt Welding ◽  
Cold Metal

In recent years, the continuous growth in manufacturing industries such as light weight structures, demands in increasing of its performance and functionality enhance the use of different materials for producing hybrid structures and thus the requirements for joining of dissimilar joints. The physical and metallurgical properties of the materials are utilised to get combined properties to achieve the product performance. On the other hand the joining methods are continuously challenging for joining of dissimilar materials. The present study reviews and describes the effective welding method of cold metal transfer for joining of dissimilar materials and its state of the art research in various materials joining. Cold metal transfer joining mechanism, capabilities of joining of dissimilar metals and their performance are reviewed. The current and emerging techniques of cold metal transfer welding method are reviewed. Methods and other technological parameters selection are described and future challenges for improving research methods on joining of dissimilar metals using cold metal transfer. Keywords: Cold Metal Transfer, MIG welding, Dissimilar materials, Mechanical properties.

Effect of path strategy on residual stress and distortion in laser and cold metal transfer hybrid additive manufacturing

2021 ◽  
pp. 102203
Author(s):  
Runsheng Li ◽  
Guilan Wang ◽  
Xushan Zhao ◽  
Fusheng Dai ◽  
Cheng Huang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Metal Transfer ◽  
Cold Metal Transfer ◽  
Cold Metal

scholarly journals Influence of post weld heat treatment on tensile properties of cold metal transfer (CMT) arc welded AA6061-T6 aluminium alloy joints

2019 ◽  
Vol 28 (1) ◽  
pp. 135-145 ◽  
Author(s):  
Addanki Ramaswamy ◽  
Sudersanan Malarvizhi ◽  
Visvalingam Balasubramanian
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Gas Metal Arc Welding ◽  
Weight Ratio ◽  
Welding Process ◽  
Metal Transfer ◽  
Post Weld Heat Treatment ◽  
Cold Metal Transfer ◽  
Cold Metal ◽  
Weld Heat

AbstractAluminium alloys of 6xxx series are widely used in the fabrication of light weight structures especially, where high strength to weight ratio and excellent weld-ability characteristics are desirable. Gas metal arc welding (GMAW) is the most predominantly used welding process in many industries due to the ease of automation. In this investigation, an attempt has been made to identify the best variant of GMAW process to overcome the problems like alloy segregation, precipitate dissolution and heat affected zone (HAZ) softening. Thin sheets of AA6061-T6 alloy were welded by cold metal transfer (CMT) and Pulsed CMT (PCMT). Among the two joints, the joint made by PCMT technique exhibited superior tensile properties due to the mechanical stirring action in the weld pool caused by forward and rearward movement of the wire along with the controllable diffusion rate at the interface caused by shorter solidification time. However, softening still exists in the welded joints. Further to increase the joint efficiency and to minimize HAZ softening, the joints were subjected to post weld heat treatment (PWHT). Approximately 10% improvement in the tensile properties had been observed in the PWHT joints due to the nucleation of strengthening precipitates in the weld metal and HAZ.

Cold Metal Transfer Spot Joining of AA6061-T6 to Galvanized DP590 Under Different Modes

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
HaiYang Lei ◽  
YongBing Li ◽  
Blair E. Carlson ◽  
ZhongQin Lin
Keyword(s):  
Heat Input ◽  
Mechanical Performance ◽  
Welding Process ◽  
High Strength ◽  
Metal Transfer ◽  
Cold Metal Transfer ◽  
Spot Joining ◽  
Predrilled Hole ◽  
Joint Quality ◽  
Cold Metal

In order to meet the upcoming regulations on greenhouse gas emissions, aluminum use in the automotive industry is increasing. However, this increase is now seen as part of a multimaterial strategy. Consequently, dissimilar material joints are a reality, which poses significant challenges to conventional fusion joining processes. To address this issue, cold metal transfer (CMT) spot welding process was developed in the current study to join aluminum alloy AA6061-T6 as the top sheet to hot dip galvanized (HDG) advanced high strength steel (AHSS) DP590 as the bottom sheet. Three different welding modes, i.e., direct welding (DW) mode, plug welding (PW) mode, and edge plug welding (EPW) mode were proposed and investigated. The DW mode, having no predrilled hole in the aluminum top sheet, required concentrated heat input to melt through the Al top sheet and resulted in a severe tearing fracture, shrinkage voids, and uneven intermetallic compounds (IMC) layer along the faying surface, leading to poor joint properties. Welding with the predrilled hole, PW mode, required significantly less heat input and led to greatly reduced, albeit uneven, IMC layer thickness. However, it was found that the EPW mode could homogenize the welding heat input into the hole and thus produce the most stable welding process and best joint quality. This led to joints having an excellent joint morphology characterized by the thinnest IMC layer and consequently, best mechanical performance among the three modes.

Sign in / Sign up

Export Citation Format

Share Document