Control of surface defects on plasma-MIG hybrid welds in cryogenic aluminum alloys

Lee, Hee-Keun; Chun, Kwangsan; Kang, Chung Gil

doi:10.1515/ijnaoe-2015-0054

Cited by 15 publications

(8 citation statements)

References 8 publications

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“…Furthermore, the LOP occurs when the weld seam is inadequate to fill the root of the joint. The LOF and LOP are caused by the low heat input from the high welding speed or the low current applied [ 48 , 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of FSW, MIG, and TIG Welding of AA5083-H111 Based on the Evaluation of Welded Joints and Economic Aspect

Habba,

Alsaleh,

Badran

et al. 2023

Materials

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Selecting an economically suitable welding technique and optimizing welding parameters to obtain high joint quality is considered a challenge for expanding the 5xxx aluminum alloy series in various industrial applications. This work aims to investigate the effect of applying different welding techniques, tungsten inert gas (TIG) and metal inert gas (MIG), as fusion welding processes compared to friction stir welding (FSW), a solid-state joining process, on the joint performance of the produced 5 mm thick similar AA5083-H111 butt weldments at different welding conditions. Different methods were used to evaluate the quality of the produced joints, including visual inspection, radiographic testing (RT), and macrostructure evaluation, in addition to hardness and tensile tests. The fracture surface of the tensile-failed specimens was also investigated using a scanning electron microscope (SEM). Furthermore, the current study ended with an economic analysis of the welding techniques used. The results showed that, for the friction stir-welded joints, the radiographic films revealed defect-free joints at the two applied travel speeds of 100 mm/min and 400 mm/min and a constant tool rotating speed of 400 rpm. In addition, only one joint was welded by MIG at a welding current of 130 Amp, with a 19 L/min flow rate of pure argon. In contrast, the radiographic films showed internal defects such as lack of fusion (LOF), lack of penetration (LOP), and porosity (P) for the two joints welded by TIG and one joint welded by MIG. The hardness of the welded joints was enhanced over the AA5083-H111 base material (BM) by 24–29, 31–35, and 46–50% for the MIG, TIG, and FSW joints, respectively. The maximum ultimate tensile strength was obtained for the FSW joint welded at a 400 mm/min travel speed. Adopting FSW in shipbuilding applications can further produce the AA5083-H11 joints with higher quality and efficiency than fusion welding techniques such as MIG and TIG processes. In addition, time and cost comparisons between TIG, MIG, and FSW were performed for five-millimeter-thick and one-meter-long AA5083-H111.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of FSW, MIG, and TIG Welding of AA5083-H111 Based on the Evaluation of Welded Joints and Economic Aspect

Habba,

Alsaleh,

Badran

et al. 2023

Materials

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“…The most widely applied processes where wires are used as filler materials are arc processes: argon-arc welding with consumable and non-consumable electrodes, current straight-polarity plasma welding with a non-consumable electrode. One of the new methods among AM processes is plasma deposition welding with a consumable electrode (plasma-metal inert gas welding) that combines consumable-electrode arc welding and plasma welding [6,7]. Plasma-metal inert gas (Plasma-MIG) welding can be defined as a combination of plasma arc welding (PAW) and gas-metal arc welding (GMAW) [8] within a single torch, where a filler wire is fed through the plasma nozzle orifice.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of the 308LSi Austenitic Steel Produced by Plasma-MIG Deposition Welding with Layer-by-Layer Peening

Ol’shanskaya

Трушников

Dushina

et al. 2022

Metals

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This paper investigates the effect of cold working via layer-by-layer peening on the microstructure and properties of a 308LSi steel workpiece produced by the wire deposition welding with a consumable electrode following the principle of 3D printing. The microstructure, phase composition and mechanical properties of the metal are studied before and after the workpiece synthesis. In the microstructure of the workpieces produced by peening, there is, in addition to austenite, a small quantity of fine-dispersed carbides and residual δ-ferrite in the interdendritic spaces. It is demonstrated that the use of layer-by-layer cold working in the process of deposition welding enables eliminating transcrystallization of the deposited metal, promotes an increase in the microstructure’s degree of dispersion and a more uniform distribution of fine-dispersed carbides in the volume of the dendrites. It is found that these structural features of the deposited metal in the additive manufacturing of a workpiece with layer-by-layer peening lead to an enhancement of the strength characteristics as compared to the material produced by the conventional wire deposition welding. Meanwhile, the level of the ductility characteristics remains high.

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“…Consumable electrode plasma-jet hard-facing (plasma-MIG) is a hybrid process that combines consumable electrode arc plasma-jet hard-facing and plasma-jet hard-facing [15][16][17][18]. The use of two sources of heating (a plasma arc from a nonconsumable anode and an arc from a consumable electrode) will allow regulating the heat input into the product in a wide range, increasing productivity and ensuring the highest quality.…”

Section: Introductionmentioning

confidence: 99%

Research of the technological methods influence on the formation of structure and properties during the additive growth of products from nickel chromium steels of the austenitic class by plasma-jet hard facing methods

Ol’shanskaya

Dushina

Трушников

2022

J. Phys.: Conf. Ser.

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The paper considers the influence of a change in the heat rate of a source with time by means of slope control, using the example of plasma-jet hard facing, as well as changes in the original structure due to laminated cool post weld upsetting of the pads, using the example of plasma-jet heat-facing with a consumable electrode (Plasma-MIG). It was found that the formation of the structure is accompanied by metal deposits transcrystallization. It is shown that the use of vibratory actions on the liquid bath by slope control modulating during plasma surfacing contributes to the partial suppression of transcrystallization of the metal deposit: the direction of columnar crystallites growth changes relative to the previous layer, contributes to the refinement of the pine-tree structure, which leads to a change in mechanical characteristics. The best properties are observed when surfacing with slope control with a frequency of 15000 Hz. The use of laminated cool post weld upsetting during the plasma-jet hard-facing by consumable electrode reduces the transcrystallization of the metal deposit. It forms dendritic crystals of an equiaxial form, which leads to the reduction of the morphological grain flow, and the strength characteristics of the fused on alloy exceeds the level of the metal durability fused on without post weld upsetting and materials obtained by traditional technologies. However, the moldability characteristics remain at a high level.

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Control of surface defects on plasma-MIG hybrid welds in cryogenic aluminum alloys

Cited by 15 publications

References 8 publications

Comparative Study of FSW, MIG, and TIG Welding of AA5083-H111 Based on the Evaluation of Welded Joints and Economic Aspect

Comparative Study of FSW, MIG, and TIG Welding of AA5083-H111 Based on the Evaluation of Welded Joints and Economic Aspect

Microstructure and Properties of the 308LSi Austenitic Steel Produced by Plasma-MIG Deposition Welding with Layer-by-Layer Peening

Research of the technological methods influence on the formation of structure and properties during the additive growth of products from nickel chromium steels of the austenitic class by plasma-jet hard facing methods

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