Resistance spot welding of AISI 430 ferritic stainless steel: Phase transformations and mechanical properties

2014 ◽  
Vol 56 ◽  
pp. 258-263 ◽  
Author(s):  
M. Alizadeh-Sh ◽  
S.P.H. Marashi ◽  
M. Pouranvari
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Phase Transformations ◽  
Ferritic Stainless Steel ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Resistance Spot ◽  
Aisi 430

Effect of Electrode Materials Type on Resistance Spot Welding of AISI 430 Ferritic Stainless Steel

2017 ◽  
Vol 31 ◽  
pp. 53-58 ◽  
Author(s):  
Murat Onsekiz ◽  
Yahya Altunpak
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Electrode Materials ◽  
Welded Joint ◽  
Peak Load ◽  
Welding Parameters ◽  
Resistance Spot ◽  
Aisi 430

In this study, AISI 430 ferritic stainless steel sheet with 0.6 mm thickness was joined by resistance spot welding using different electrode materials. The effects of electrode materials and welding parameters on the mechanical properties of welded samples are defined in terms of peak load. The hardness and tensile shear load bearing capacity of welded joint was determined and the microstructure of welded samples was also evaluated. The most suitable welding parameters for each electrode material were determined.

Impact of process parameters of resistance spot welding on mechanical properties and micro hardness of stainless steel 304 weldments

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Raman Kumar ◽  
Jasgurpreet Singh Chohan ◽  
Rohit Goyal ◽  
Piyush Chauhan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Holding Time ◽  
Current Intensity ◽  
Content Type ◽  
Resistance Spot ◽  
Stainless Steel 304

PurposeResistance spot welding (RSW) is an essential process in the automobile sector to join the components. The steel is the principal material utilized in car generation because of its high obstruction against erosion, toughness, ease of support and its recuperation potential. Due to this, it was planned to study the mechanical properties, hardness and microstructure characteristics of RSW of Stainless steel 304.Design/methodology/approachIn the present research, RSW of 304 stainless steel plates with 1 mm thickness and effect of current intensity, welding time, electrode pressure and holding time on nugget diameter, tensile strength microhardness and microstructure of the joints was investigated. The specimens were prepared according to the dimensions of 30 × 100 mm with 30 mm overlaps joint through the RSW machine. The tensile test of the specimen was carried out on a universal testing machine and microhardness of specimens measured using Vickers’s hardness tester. Taguchi L16 orthogonal array was used to scrutinize the significant parameters for each output.FindingsIt has been observed that the tensile strength of the specimen is affected by the current intensity and nugget diameter, and the weld time has a significant effect on the tensile strength. Microhardness is highly influenced by electrode pressure and holding time, as the increase in both these parameters resulted in the increase of microhardness. This is due to rapid cooling, which is done by the cooling water flowing through the copper electrodes.Originality/valueThis study was carried out using a copper electrode with a flat face with selected parameters and response factors. The study can be useful for researchers working on optimization of welding parameters on stainless steel.

Micro Hardness in the Welded Area at Resistance Spot Welding

2016 ◽  
Vol 1138 ◽  
pp. 153-158
Author(s):  
Mihai Boca ◽  
Gheorghe Nagit ◽  
Laurenţiu Slătineanu
Keyword(s):  
Mechanical Properties ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Graphical Representation ◽  
Welding Process ◽  
Electrical Current ◽  
Micro Hardness ◽  
Current Time ◽  
Resistance Spot ◽  
Welding Spot

The resistance spot welding process represents the welding technology used to obtain assemblies trough welded spots characterized by adequate mechanical properties. This assembly process is used mainly into the automotive, petroleum and naval industries. It is applied due to the significant advantages concerning the technology and service properties of the obtained assembly. This paper purposes a study concerning the micro hardness change of an assembly made by resistance welding spot. The entire process of plastic deformations together with the solidification step developed in the presence of the heat generated during welding process determines the mechanical characteristics of the welded spot and, of course, of the assembly obtained. In such conditions, depending on the changes developed during the welding process, the micro hardness of the welded spot varies between the fusion area (FA) and heat affected zone (HAZ). In this way, the graphical representation of the micro hardness repartition gives clues about the weakness areas which don’t correspond to the requirements. As input factors, in this study, the values of current intensity, the electrical current time and the force pressure were considered. In order to solve the proposed problem and to graphically highlight the variation of the micro hardness obtained for welded points, it was used a classical welding device and a micro hardness device analyzer. The graphical representation shows that the micro-hardness and, as a consequence, some mechanical properties changes in the specified region and in the entire mass of the welded spot changes. In this way, the structure of welded spot is characterized by a variation of the hardness in the interest areas.

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