Analysis of weld characteristics of micro plasma arc welded thin stainless steel 306 L sheet

Prasad, Srikant; Pal, Sukhomay; Robi, P. S.

doi:10.1016/j.jmapro.2020.07.062

Cited by 24 publications

(7 citation statements)

References 28 publications

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“…With increase in welding current, the heat input increases leading to full penetration thereby resulting in increased UTS and % elongation. The variation of UTS with welding current of as-welded samples is shown in Figure 7d, the plots of YS and % EL values vs. welding current of as-welded samples can be found in [32]. The trend is similar except the spread is larger.…”

Section: Effect Of Process Parameters On Mechanical Propertiesmentioning

confidence: 70%

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Effect of post welding heat treatment on the weld quality of micro plasma arc welded SS-316L thin sheet

2022

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High thermal gradient formed during the fusion welding process results in development of undesirable residual stress in the weldments. This stress is developed due to restraint by the parent metal during weld solidification. The high heat input results in non-uniform heat distribution across the weld region in other words non-uniform microstructural development across the weld region and hence the mechanical properties of the joint are often not uniform. In order to avoid inhomogeneity in the mechanical properties and also to reduce/eliminate undesirable residual stress, the welded samples are given post welding heat treatment. In this research, 500 µm thin SS-316L sheets are welded using micro plasma arc welding process and then the welded specimens are heat treated. The welding experiments are conducted by varying welding speed, welding current and stand-off distance. Weld bead microstructure, microhardness, ultimate tensile strength (UTS), yield strength and percentage elongation are determined before and after heat treatment. The effects of welding heat input and process parameters on the measured weld qualities are studied. Analysis of variance is also performed to estimate the influence of factors and their interaction on the weld quality. The post weld heat treatment results in an increase in the grain size of the HAZ and is found in the range of 38.96 µm to 56.22 µm whereas for as-welded samples it is in the range of 29.88 µm to 50.40 µm. The average UTS value of the heat treated samples is increased by 9.9% compared to the as-welded samples. The hardness of the fusion zone varies in the range of 175-215 HV.

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Section: Effect Of Process Parameters On Mechanical Propertiesmentioning

confidence: 70%

“…Figure 5. Variation of grain size at HAZ with (a) welding current (b) welding speed and (c) stand-off distance of heat treated samples (d)welding speed for as-welded samples[32].…”

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Effect of post welding heat treatment on the weld quality of micro plasma arc welded SS-316L thin sheet

2022

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“…However, the melted powders could fill the gap between the two sides of the sheets, and well joint formation could be achieved as specimen S10 illustrated. This was very difficult to be realized during traditional laser welding because the gap between the two sides of the sheets could cause burn through easily (Prasad et al, 2020;Kadir et al, 2021). Frontiers in Materials frontiersin.org…”

Section: Macro Morphology Of the Jointsmentioning

confidence: 99%

Quick butt welding of steel sheets using the high-speed laser cladding method

Liu²,

Shen³

et al. 2022

Front. Mater.

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Laser butt welding of thin steel sheets without filler material was widely used in many industrial fields. However, it was very difficult to focus the small laser spot on the narrow gap between the sheets during the laser butt welding process. In this study, a new method to weld thin steel sheets using a high-speed laser cladding technique is proposed. Stainless steel sheets with a thickness of 0.5 mm were welded using the high-speed laser cladding process. The results illustrated that good weld joints could be obtained without obvious cracks and pores in most of the specimens. The joints were well formed even if the sheets were not spliced together entirely. The average tensile strength of the specimens was about 500 MPa, which is almost the same as that of the substrate. The results also showed that most of the failures did not happen in the welding region, which could be concluded that the strength of joints was higher than that of the substrate. The microstructure was determined using an optical microscope (OM) and scanning electron microscope (SEM). The results showed that it may be a good choice to use the high-speed laser cladding technique for butt welding of stainless steel sheets.

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“…It is sensitive to the change of parameters and may become unstable due to the behavior of molten metal [6]. Prasad have pointed that the uncontrolled variation may lead to the keyhole closure or collapse of the weld pool [7]. As a result, it is difficult to maintain a stable keyhole by optimizing the process parameter window in PAW.…”

Section: Introductionmentioning

confidence: 99%

Visual Sensing And Controlling of The Keyhole In Robotic Plasma Arc Welding

Wang

Yamane

Wang

et al. 2022

Preprint

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With an advantage of "single-sided welding and double-sided forming", plasma arc welding (PAW) has a great application potential in modern industrial production. The welding quality can be guaranteed by sensing and controlling of the keyhole. However, it is difficult to make an on-line observation on the back of base metal, and realize a dynamic registration of the visual sensor and welding torch. In this study, it has investigated the relationship between the welding condition and image feature of keyhole. Image processing is designed to obtain the feature image and conduct a template matching of the keyhole. The target feature of weld zone will be extracted and processed in real time. Besides, it has designed a digital controller for the welding robot and power source in this study, and discussed control method to stabilize the keyhole and achieve good welding quality. Eventually, experiments are conducted to inspect the comprehensive performance of the welding control system with varying disturbance. This study is of important significance for the visual sensing and controlling of the keyhole in PAW. It will provide technical support for the weld quality control, and promote the development of welding technology based on machine vision in intelligent manufacturing field.

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Analysis of weld characteristics of micro plasma arc welded thin stainless steel 306 L sheet

Cited by 24 publications

References 28 publications

Effect of post welding heat treatment on the weld quality of micro plasma arc welded SS-316L thin sheet

Effect of post welding heat treatment on the weld quality of micro plasma arc welded SS-316L thin sheet

Quick butt welding of steel sheets using the high-speed laser cladding method

Visual Sensing And Controlling of The Keyhole In Robotic Plasma Arc Welding

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