An investigation into the processes of projection welding of galvanised sheet

Papkala, H.

doi:10.1080/09507119609548941

Cited by 4 publications

(3 citation statements)

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“…Therefore, a progressive adjustment of the projection dimensions and the welding regime parameters values is necessary to obtain a correct joint [5][6][7]. At the same time, it is necessary to remove contaminating elements from the surfaces to be welded (grease and oxide films) that can significantly reduce the quality of welds, especially in the case of multi-point joints [7][8].…”

Section: Introductionmentioning

confidence: 99%

The Multipoint Relief Projection Study

2023

PSEN

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Projection welding is a joining process based on the electrical resistance of metal components that have small protrusions on the areas where assembly is desired. In this case, the welding electrodes that ensure the transfer of the electric current have a flat geometry, which allows uniform pressing of the areas with protrusions, which have the role of ensuring the concentration of the current lines for the formation of welding points. Excessive deformation can cause the protrusions to collapse rapidly, causing greater dispersion of the current and limiting the effect of localized heating and melting, and welding no longer occurs. The process is widely used in the electrical, electronic, automotive, food and construction industries, etc. The paper analyzes the effect of regime parameter values during the resistance welding process on the joints made between 2 steel components with surfaces protected by aluminization. The surface of one of the components was imprinted with 5 equidistant protrusions created by plastic deformation to concentrate the electric current lines and achieve melting points with a limited surface area. The thin layer of aluminum deposited on the surfaces of the parts has the role of protection against corrosion, but it produces hard compounds located on the welding interface. The chemical micro-composition analyzes performed with the EDAX method highlighted the diffusion effects of chemical elements in the welding area and the formation of hard compounds Al-rich loccated on the fusion line of the welded points. The microstructure of the welded areas was analyzed and the fracture strength tests of some welded samples were performed to establish the most suitable values of the welding process for this application.

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Section: Introductionmentioning

confidence: 99%

The Multipoint Relief Projection Study

2023

PSEN

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“…In projection welding the nut leg geometry is decisive for the joint resistance (the optimum value is less than 0.2mm) [4]. Due to the fast decrease in the yield strength value of the material during heating, many tests are required to adjust the right values of the welding parameters [5]- [7]. The surface preparation of the samples before welding is an important factor that affects the weld quality.…”

Section: Introductionmentioning

confidence: 99%

“…The surface preparation of the samples before welding is an important factor that affects the weld quality. Any contaminant, like grease and oxide pellicles dramatically affect the resistance of the contact area between pieces [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Case Study About Resistance Projection Welding of Aluminized Steel Parts

Voiculescu

Oprea

Vasile

2021

AWET

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Resistance projection welding is a non-polluting mechanized process used to obtain an assembly between similar or dissimilar metallic materials. The main advantages of this welding process are the possibility to achieve many different welded points at the same time and the long life of the electrodes compared to the spot-welding process. The paper analyses the effects of thin aluminium coating existing on mild steel parts of on the correct formation of welding points when assembling moulds for the manufacture of baking bread. From optical and electron microscopy analyses it resulted that some adjacent welded points show an interrupted fusion line, sprinkled with elongated islands of aluminium-rich compounds. The paper presents the effect of changing the values of the welding parameters on the weld spot size, in correlation with the Al-rich inclusions that appear on the weld fusion zone. The best results have been obtained when the welding parameters values were the follows: electrode pressure of 2.6 bar, welding power of 19.18kVA and welding time of 7ms. The problems that occur when electric resistance welding of parts with aluminium coating have been highlighted, being useful for specialists who make products using this welding process.

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