Dissimilar resistance spot welding of DP600 dual phase and AISI 1008 low carbon steels: correlation between weld microstructure and mechanical properties

2011 ◽  
Vol 38 (6) ◽  
pp. 471-480 ◽  
Author(s):  
M Pouranvari ◽  
S P H Marashi ◽  
S M Mousavizadeh
Keyword(s):  
Mechanical Properties ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Carbon Steels ◽  
Dual Phase ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Weld Microstructure ◽  
Resistance Spot ◽  
Microstructure And Mechanical Properties

Effect of Electrode Force on Expulsion in Resistance Spot Welding with Initial Gap

2011 ◽  
Vol 675-677 ◽  
pp. 795-798 ◽  
Author(s):  
Jie Shen ◽  
Yan Song Zhang ◽  
Xin Min Lai
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Sheet Thickness ◽  
Carbon Steels ◽  
Dual Phase ◽  
Low Carbon ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Electrode Force ◽  
Joint Quality

Compared with the conventional low carbon steels, the expulsion is more prone to occur in resistance spot welding (RSW) of dual phase (DP) steels. Especially when the initial gap exists between the steel sheets, the weld expulsion would reduce the weld quality of the joint. It is important to decrease or inhibit the occurrence of the weld expulsion in auto-body assembly line in order to guarantee the joint quality. In this study, the experiments of RSW with different initial gaps have been done to study the effect of the electrode force on the expulsion using different thicknesses of dual phase steels. The results show that the increment of the electrode fore would enable to decrease the occurrence of expulsion with the increase of the sheet thickness and gap spacing in resistance spot welding of DP steel sheets.

scholarly journals Effect of Welding Current on Weld Formation, Microstructure, and Mechanical Properties in Resistance Spot Welding of CR590T/340Y Galvanized Dual Phase Steel

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2310 ◽  
Author(s):  
Xinge Zhang ◽  
Fubin Yao ◽  
Zhenan Ren ◽  
Haiyan Yu
Keyword(s):  
Mechanical Properties ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Dual Phase Steel ◽  
Welding Current ◽  
Dual Phase ◽  
Weld Formation ◽  
Resistance Spot ◽  
Microstructure And Mechanical Properties ◽  
Body Production

During resistance spot welding, the welding current is the most important process parameter, which determines the welding heat input and then has a great influence on the welding quality. In present study, the CR590T/340YDP galvanized dual phase steel widely used as automobile material was carried out using resistance spot welding. The effect of welding current on the weld formation, microstructure, and mechanical properties was studied in detail. It was found that the quality of weld appearance decreased with the increase of welding current, and there was a Zn island on the weld surface. The microstructure of the whole resistance spot welded joint was inhomogeneity. The nugget zone consisted of coarse lath martensite and a little of ferrite with the columnar crystal morphology, and the microstructure of weld nugget became coarser when the welding current was higher. There was an optimum welding current value and the tensile strength reached the maximum. This investigation will provide the process guidance for automobile body production.

The Influence of Enamel Firing Process on Microstructure and Mechanical Properties of Steel Substrate

2011 ◽  
Vol 194-196 ◽  
pp. 144-149
Author(s):  
Ai Wen Zhang ◽  
Si Hai Jiao ◽  
Zheng Yi Jiang ◽  
Quan She Sun ◽  
Dong Bin Wei
Keyword(s):  
Mechanical Properties ◽  
Steel Substrate ◽  
Carbon Steels ◽  
Firing Process ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Microstructure And Mechanical Properties ◽  
Enamel Frit ◽  
The Impact ◽  
Decarburized Layer

The as-rolled and enamel fired microstructure and mechanical properties of two low carbon steels with different compositions were analysed in the paper. The results show that the grains do not coarsen in lab firing process, and could be refined after industrial enamel firing process. The strength can keep stable in the firing process and the impact energy could be enhanced greatly under the industrial enamel firing process. The surface decarburized layer was occurred as a result of chemical reaction among the carbon in steel and water, oxides in the enamel frit.

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