Effect of aluminium sheet surface conditions on feasibility and quality of resistance spot welding

Han, Lei; Thornton, Martin; Boomer, D. R.; Shergold, Mike

doi:10.1016/j.jmatprotec.2010.02.019

Cited by 41 publications

(23 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The necessity for surface pre-treatment methods is further justified since the aluminium welds are susceptible to porosity which can be originated from the surface contamination (grease, oil etc.). However, in industrial practice, the removal of the oxide layer is often neglected due to the technical difficulties and financial reasons [15,16]. & The formation of shrinkage cavity and the avoidance of hot cracking can be treated by the application of higher post pressing force, which demand supplementary equipment in the welding machine.…”

Section: Resistance Spot Welding Of Aluminium Alloysmentioning

confidence: 99%

Improving the properties of AA7075 resistance spot-welded joints by chemical oxide removal and post weld heat treating

et al. 2020

View full text Add to dashboard Cite

The aluminium alloy studied in this paper is the heat treatable AA7075 which has zinc as the main alloying element. 7xxx aluminium alloys have the best strength performance among all commercial series and AA7075 has tensile strength above 500 MPa. The outstanding strength properties open the possibility to use this alloy in automotive industry as a possible alternative material for car body elements instead of steel. However, their limited formability properties mean obstacle when a complicated shape car body panel is formed, since the elongation is limited only between 5 and 11%. In order to successfully form these sheets into the demanded geometry, hot forming should be used, and thus the body panels should be formed when the AA7075 is in a solution heat treated condition, such as using the HFQ® process. Then, after assembling the body elements, when resistance spot welding is among the most common joining methods, the AA7075 body parts should get the artificial ageing. It means that welding is followed by artificial ageing as a kind of post weld heat treating which can partially compensate the softening of this alloy during welding. Softening is considered among the most challenging weldability issues similarly to the high melting point oxide layer at the surface which also reduces the load bearing capacity of RSW joints. During the performed experimental program, three routes were investigated. The RSW experiments are performed on 1-mm-thick AA7075 sheets. The spot-welded joints were examined by macroscopic testing, tensile shear and hardness tests.

show abstract

Section: Resistance Spot Welding Of Aluminium Alloysmentioning

confidence: 99%

Improving the properties of AA7075 resistance spot-welded joints by chemical oxide removal and post weld heat treating

et al. 2020

View full text Add to dashboard Cite

show abstract

“…-Ergonomics and ease of use [5]. The device is quite easy to disassemble, and bend the corrugated body of the electrodes in the required direction to perform difficult-toaccess work; -Increased maintainability due to ease of repair and availability of spare parts and components [6].…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Calculation of the Energy of Capacitors for a Spot Welding Apparatus by a Numerical Method

Varlamov

Fironov

Kanareykin

et al. 2020

Proceedings of the 30th International Conference on Computer Graphics and Machine Vision (GraphiCon 2020). Part 2

View full text Add to dashboard Cite

This article provides information on the development of an adjustable spot welder implemented on the basis of the capacitor principle without a transformer. Also the scientific work considers the calculation of the energy of the capacitors for a spot welding apparatus using modern methods of numerical simulation and programming. The method of calculation is given, as well as a mathematical solution tool. The calculation results are compared with the experiment. Based on the data obtained, according to the results of calculations, work was carried out on a prototype, the result of which was an adjustable spot welder. It allows you to accurately and quickly weld nickel plates to lithium cells, creating full-fledged batteries from them, which are widely used in modern technology, including promising vehicles. The presence of sensors and a screen allows the operator to control the charging process and the direct operation of the unit, which simplifies the use of the device.

show abstract

“…The disadvantage of welding technology is the great influence on the properties of the joined material as a result of heat affected zone. Welding technologies cannot always be used due to the fact that they provide large amounts of heat to the connection area, which causes deformation of the structure joined [3][4]. In the case of making connections of non-ferrous metal sheets, the welding methods are too expensive while also causing numerous technological difficulties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate

2019

View full text Add to dashboard Cite

In this paper, the results of experimental and numerical studies on joining the thin fins to the thick base plate of a heat exchanger are presented. The elements of the heat exchanger were joined by using developed method of press forming. The joining technology consists in clamping the sheet metal into the channel of the base plate using a punch with specific geometry. The effect of different configurations of the punch geometry (shape, radius and distance between fin and punch) and the indentation depth on the depth of the interface between the fin and base plate is analysed. Furthermore, the effect of different combinations of fin-base plate materials has been numerically studied. The plate material was the AA2219 -T851 aluminium alloy, while the fins were made of the AA5251 aluminium alloy. The elastic-plastic numerical computations of the joining process have been carried out using the finite element-based MSC.Marc program. It was found that the area of the contact of the fin with the base plate can be optimised by choosing the right parameters of the tool geometry and technological parameters. Experimental research has shown that increasing the punch indentation causes the material to flow in the transverse direction to the punch and the indirect extrusion in the region between the punches.

show abstract

Effect of aluminium sheet surface conditions on feasibility and quality of resistance spot welding

Cited by 41 publications

References 12 publications

Improving the properties of AA7075 resistance spot-welded joints by chemical oxide removal and post weld heat treating

Improving the properties of AA7075 resistance spot-welded joints by chemical oxide removal and post weld heat treating

Calculation of the Energy of Capacitors for a Spot Welding Apparatus by a Numerical Method

Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate

Contact Info

Product

Resources

About