An investigation of variable welding current on impact strength of metal inert gas welded specimen

Sehgal, Anuj Kumar

doi:10.1016/j.matpr.2020.10.151

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…Joining elements with a consumable electrode in arc welding Metal Inert Gas (MIG) or a consumable electrode in active gas Metal Active Gas (MAG) are leading methods in production processes. These methods enable high welding performance, easy inspection of the arc weld, the possibility of careful observation of the weld pool, the possibility of combining a wide range of materials, obtaining good mechanical properties of connections, and ease of mechanization and robotization of the welding process [ 1 , 2 , 3 , 4 ]. However, the traditional methods of MIG/MAG welding of steel materials with a thickness of less than 3 mm cause many technological problems.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Joints Depending on the Process Used

et al. 2022

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Today, numerous design solutions require joining thin-walled sheets or profiles as the traditional methods of welding with a consumable electrode in gas shielding, most often used in production processes, do not work well. The reason for this is that a large amount of heat is supplied to the joint, causing numerous welding deformations, defects, and incompatibilities. Moreover, the visual aspect of the connections made more and more often plays an equally crucial role. Therefore, it is important to look for solutions and compare different joining processes in order to achieve production criteria. The paper compares the properties of a 1.5 mm thick steel sheet joined by the manual and robotic MAG 135 and 138 welding process, manual and robotic laser welding, CMT welding with the use of solid or flux-cored wire, and butt welding. The macro- and microstructure, as well as the microhardness distribution of individual regions of the joints, were analyzed depending on the type of joining technology used. Furthermore, the mechanical properties of individual zones of joints were investigated with the use of a digital image correlation system. On the basis of the obtained test results, it was found that the joints made by the processes of manual laser welding and butt welding were characterized by a very regular weld shape, the smallest joint width, and greater grain refinement compared to other analyzed processes. Moreover, this method was characterized by the narrowest zone of hardness increase, only 3 mm, compared to, e.g., a joint made in the process of robotic welding CMT, for which this zone was more than twice as wide. Furthermore, the heat-affected zone for the joints made in this way, in relation to the welds produced by the MAG 135/138 method, was, respectively, 2 and 2.7 times smaller.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Joints Depending on the Process Used

et al. 2022

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“…Underwater welding is one of the most signi cant technology for manufacturing and repairing 304 stainless steel structures in the marine equipment, including offshore drilling platform, marine engineering vessel, offshore wind power and nuclear power plant [2]. Underwater welding technique mainly includes wet welding, dry welding and local dry welding [3]. Among them, local dry underwater welding (LDUW) has gradually become a research hotspot in the eld of underwater welding due to high exibility, good adaptability, low cost, and good weld formation [4][5].…”

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confidence: 99%

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater MIG welding

Liao¹,

Zhang²,

Li³

et al. 2022

Preprint

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In this study, 304 stainless steel which widely used in the industrial field due to its excellent thermostability, corrosion resistance and welding performance, was welded using local dry underwater pulse metal inert-gas (LDU-PMIG) welding technology. The effect of different pulse peak currents on droplet transfer behavior and weld formation was studied. The results show that short circuit transfer, globular transfer, and projected transfer could be observed in the LDU-PMIG process. With the peak current of 240A, the droplet transfer mode was short circuit transfer and globular transfer, the weld formation was irregular with large particle spatters around the weld. With the peak current increased to 260A, the droplet transfer mode changed into the globular transfer, and the weld formation quality was improved. With the peak current of 280A, the droplet transfer mode was projected transfer, the weld formation was satisfied with few spatter, and the coefficient of weld formation was the largest, projected transfer was the most stable mode. With the increase of the peak current from 300A to 320A, the droplet transfer mode did not change, but the instability of the welding arc resulted in poor weld formation with serious spatters and undercuts.

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Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater pulse MIG welding

Liao

Zhang

et al. 2022

Int J Adv Manuf Technol

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An investigation of variable welding current on impact strength of metal inert gas welded specimen

Cited by 6 publications

References 10 publications

Microstructure and Mechanical Properties of Joints Depending on the Process Used

Microstructure and Mechanical Properties of Joints Depending on the Process Used

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater MIG welding

Effect of pulse current on droplet transfer behavior and weld formation of 304 stainless steel in local dry underwater pulse MIG welding

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