Influence of the CO2 Content in Shielding Gas on the Temperature of the Shielding Gas Nozzle during GMAW Welding

Lohse, Martin; Trautmann, M.; Füssel, Uwe; Rose, Sascha

doi:10.3390/jmmp4040113

Cited by 7 publications

(8 citation statements)

References 13 publications

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“…The MG70S-6 electrode wire diameter is 1.2 mm [15]. And all the welding tests are conducted under 100 % CO 2 shielding gas condition [16,17]. The experiment plan is based on the design of the experiment for 3 process parameters and 3 levels.…”

Section: Methodsmentioning

confidence: 99%

The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

2023

Eureka: PE

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This work presents the experimental results of narrow gap butt welding of steel plates with large thickness by using the Metal Active Gas (MAG) welding method.The typical defects are accompanied with this process such as the infusion in the side wall and the porosity due to the narrow gap which affect on the melting process. Thus, some publications noted the results of welding for the thickness up to 20−30 mm and the chamfer angle about 30° using GMAW/MIG, GTAW/TIG, SMAW and new development such as laser – arc hybrid, laser multi- pass technique, super -TIG welding etc. But the production requires the solution to save the costs by the reduction of time, labour and investment keeping the standard quality. That is the aim of this study. In order to improve the quality of weld joint and increase the productivity of the process, is it suggested to develop the innovative welding process, in which the welding voltage – Uw, the translational velocity of the tip – Vt, and rotational velocity of the tip – Vr, are changing. This helped to increase the thickness of steel plates up to 50 mm and the chamfer angle decreased at 15°, providing the satisfied quality of the weld. The micrography study serve as the preliminary proof of this hypothesis. The microstructures in 4 regions, such as the weld center zone, heat-affected zone (HAZ), parent metal region, and the boundary between the weld metal and the HAZ were examined. The microstructures of 13 positions from different experiments are investigated using the optical microscope (Axiovert 25).These experiments covered all specific points (node) locating accordingly to three layers from bottom to top of the weld joint . The findings proved the welding quality is similar in case of narrow gap but the chamfer angle is twice lower and the thickness is increased. The result of the study enhances the productivity due to saving the labour cost and the welding materials. It is recommended to consider the effect of other factors (such as cooling conditions, dwell time when the arc approaching the side walls) to optimize the weld quality. There is the huge volume of the heavy steel constructions with the thick steel construction and specific narrow gap in industry. The results of this study with the optimization and more deeper evaluation the influence of main parameters of welding process to eliminate the typical defects will be the valuable reco mmendation for the managers and engineers in the production of metallic constructions

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Section: Methodsmentioning

confidence: 99%

The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

2023

Eureka: PE

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“…To summarize, automated MIG welding is an e cient method for connecting different metals and steels. According to research, choosing the right factors, such as joint design, ller metal selection, welding settings, shielding gas composition, and heat treatment, may help assure high-quality welds [25][26][27][28][29]. There is a signi cant gap in information regarding the best parameters and process conditions for automated MIG welding of stainless steel SS316 with low alloy steel AISI4140.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Investigation and Parametric Optimization of Automated MIG welding Stainless Steel SS316 with Low Alloy Steel AISI 4140 on Mechanical Properties

Deko,

Beri,

Rajhi

et al. 2024

Preprint

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In marine, aerospace, automotive, and biomedical engineering, components and structures are made of different materials that have properties in order to meet specific performance requirements. Stainless steel 316 and low alloy steels are the most commonly used materials in the marine industry, where corrosive resistivity and high specific strength are the design requirements. This was the main importance of welding dissimilar metal using automated MIG to increase productivity, improve quality, reliability, and reduce labor costs. This research work aimed to study how different MIG process parameters (welding current, wire feed rate, gas flow rate, and welding speed) affect the mechanical properties of welding two different metals together, namely stainless steel 316 and low alloy steel 4140. To study the significance and contribution of each parameter, analysis of variance (ANOVA) were conducted using Minitab 21 software. The tensile strength and flexural strength experimental results showed that the welding current parameter has a high significant effect in both cases, followed by welding speed. The hardness result shows that the welding speed followed by the welding current has a significant effect on hardness. Weld metal had higher hardness than stainless steel and low alloy steel base metals.

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“…The tensile test results of the joints were shown in 12. The fracture section of the welded seam formed under the flowrate of 8 L/min was the transgranular fracture along the cleavage planes, and thus, could be classed as brittle fracture; the fracture section of welded seam formed under the flowrate of 12 L/min contained a large number of dimples and there was a certain amount of inclusions at the bottom of these dimples [31], indicating that the fracture belonged to the ductile regime. The fracture section of the seam formed under a flowrate of 16 L/min was a transgranular fracture along the cleavage plane, indicating that it belongs to the brittle fracture.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam by Twin-wire GMAW Welding for Duplex Stainless Steel

Yu¹,

Xue²

2023

Preprint

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Aiming to diminish the defects caused by high-speed pulsed GMAW welding, such as non-penetration, non-fusion, humping and undercut, the paper proposed an improved twin-wire double-pulsed high-speed welding process by introducing the impact of additional shielding gas on the welding pool and the effects of different shielding gas flowrates on the microstructure and mechanical properties of the welded seam was investigated. The 2205 duplex stainless steel plate was used as the base material for the butt welding test, and the welded seams were subjected to tensile test, metallographic analysis, hardness analysis, and nondestructive testing. The results indicate that as the flowrate of additional shielding gas increases in the range of 8 L/min~16 L/min, the width of the welded seam increases and the height of reinforcement decreases gradually. However, a grooved seam with a lower middle region and higher sides will appear when the gas flowrate becomes excessively large. The test results indicate that the jet impact force is relatively moderate when the flowrate of the additional shielding gas is 12 L/min and thus, is optimal for the welded seam.

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Influence of the CO2 Content in Shielding Gas on the Temperature of the Shielding Gas Nozzle during GMAW Welding

Cited by 7 publications

References 13 publications

The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

The evaluation on performance of narrow- gap welding thick steel plates under the influence of main welding parameters

Experimental Investigation and Parametric Optimization of Automated MIG welding Stainless Steel SS316 with Low Alloy Steel AISI 4140 on Mechanical Properties

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam by Twin-wire GMAW Welding for Duplex Stainless Steel

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