Research on Resistance Spot Welding Property of Hot-Stamping Quenched Steel Sheets

2014 ◽  
Vol 1063 ◽  
pp. 120-125
Author(s):  
Jun Ping Zhang ◽  
Yi Feng ◽  
Lei Feng Song ◽  
Guang Yao Wang ◽  
Qing Sheng Jin
Keyword(s):  
Mechanical Property ◽  
Hot Stamping ◽  
Welding Current ◽  
Welding Parameters ◽  
Good Mechanical Property ◽  
Welding Time ◽  
Steel Sheets ◽  
Power Frequency ◽  
Quenched Steel ◽  
Hot Stamping Steel

22MnMoB hot-stamping quenched steel sheets were well welded together by power frequency spot welder with optimization of relevant welding parameters in this paper. According to the experiment results of welding spatter, maximum shearing force and the size of nugget, the effects of welding current, welding time and electrode pressure on weld property were advanced. The results show that while welding current, welding time and electrode pressure are respectively set as 6.0~6.5kA, 0.5~0.7s and 4~7kN, the weld exhibits good mechanical property. The nugget diameter appears approximate linear relationship with mechanical property of weld and determines the fracture model of welds. The novel hot stamping steel sheets exhibit good welding property. The optimizing welding parameters can be used to instruct the practical production.

scholarly journals Investigation of the Microstructural Evolution during Hot Stamping of a Carburized Complex Phase Steel by Laser-Ultrasonics

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1836
Author(s):  
Alexander Horn ◽  
Marion Merklein
Keyword(s):  
Microstructural Evolution ◽  
Hot Stamping ◽  
Laser Ultrasonics ◽  
Complex Phase ◽  
Finished Steel ◽  
Steel Sheets ◽  
Fine Grain ◽  
Martensitic Microstructure ◽  
Ultrasound Sensor ◽  
Hot Stamping Steel

Prior carburization of semi-finished steel sheets is a new process variant in hot stamping to manufacture parts with tailored properties. Compared to conventional hot stamping processes, a complex phase typed steel alloy is used instead of 22MnB5. Yet recent investigations focused on final mechanical properties rather than microstructural mechanisms cause an increase in strength. Thus, the influence of additional carburization on the microstructural evolution during hot stamping of a complex phase steel CP-W®800 is investigated within this work. The phase transformation behavior, as well as the grain growth during austenitization, is evaluated by in-situ measurements employing a laser-ultrasound sensor. The results are correlated with additional hardness measurements in as-quenched condition and supplementary micrographs. The experiments reveal that the carburization process significantly improves the hardenability of the CP-W®800. However, even at quenching rates of 70 K/s no fully martensitic microstructure was achievable. Still, the resulting hardness of the carburized samples might exceed the fully martensitic hardness of 22MnB5 derived from literature. Furthermore, the carburization process has no adverse effect on the fine grain stability of the complex phase steel. This makes it more robust in terms of grain size than the conventional hot stamping steel 22MnB5.

Effect of Welding Current and Welding Time for Micro Resistance Spot Welding on Dissimilar Thin Thickness Materials of Al 1100 and KS 5 Spring Steel

2016 ◽  
Vol 842 ◽  
pp. 120-124 ◽  
Author(s):  
Ario Sunar Baskoro ◽  
Hakam Muzakki ◽  
Winarto
Keyword(s):  
Cycle Time ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Current ◽  
Spring Steel ◽  
Welding Parameters ◽  
Shear Load ◽  
Welding Time ◽  
Resistance Spot ◽  
Fracture Area

In the dissimilar materials and dissimilar thin thickness sheets joining, welding current and welding time parameters of resistance spot welding (RSW) effect weld ability. RSW used for joining thin plate less than 1000 μm is called micro-resistance spot welding (μRSW). The objective of this article is to study the effect of welding current and welding time to the joining dissimilar thin thickness materials and the microstructure of a weld joint. The thickness of Al 1100 is 400 μm, and KS 5 Spring Steel is 200 μm. Welding parameters are Cycle Time 0.5, 1, 1.5, Welding Current 1kA and 2 kA, and holding time 10 second. Welding current 1kA, Cycle time of 0.5 produce maximum shear load of 227.4 N and fracture area of 6.644 mm2. Welding current 2 kA, cycle time of 1.5 affect maximum load of 222.7 N and fracture area of 10.559 mm2. Welding parameters lead to the majority fracture on aluminum material. The welding current and cycle time do not significantly affect maximum shear load and fracture area.

Study on Resistance Spot Welding Technology and Properties of TRIP800 High Strength Steel Sheet

2011 ◽  
Vol 391-392 ◽  
pp. 661-665
Author(s):  
Yan Yu ◽  
Feng Xue Wang ◽  
Zai Dao Yang
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
Spot Welding ◽  
Welding Current ◽  
High Strength ◽  
Welding Parameters ◽  
Welding Time ◽  
Test Analysis ◽  
Welding Technology ◽  
Welding Electrode

A series of spot welding technology, joint mechanical properties and microhardness test analysis of TRIP800 high strength steel were researched. Based on these experiments and analysis, effect of spot welding parameters such as welding current, welding time and electrode pressure on joint mechanical properties were explored. The relevant spot welding parameters of TRIP800 high strength steel of spot welding were recommended, such as welding current is7.5~8.0KA, electrode pressure is 450 kgf and welding time is 20cyc. Welding electrode should be to ensure that as much as possible and clean the surface,to avoid welding current and welding time is too high or too long, as well as forging lack of power, to prevent the occurrence of welding defects.

scholarly journals Optimization of Resistance Spot Welding (RSW) Parameters by using Taguchi Method

2020 ◽  
Vol 9 (3) ◽  
pp. 2795-2800
Keyword(s):  
Shear Strength ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Current ◽  
Welding Parameters ◽  
Welding Time ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Resistance Spot ◽  
Electrode Force

This study was intended to optimize the resistance Spot Welding Parameters (RSW) of sheet metals joints. The variation parameters selected were electrode force, welding current and welding time of 1.2 mm thickness low carbon steel. The settings of process parameters were conducted according to the L9 Taguchi orthogonal array in randomized way. The optimum process parameter was then obtained by using signal to noise ratio and analyzed further on the significant level by using Analysis of Variance (ANOVA). The developed response has been found well fitted and can be effectively used for tensile shear strength prediction. The optimum parameters achieved were electrode force (2.3 kN), welding time (10 cycles) and welding current (8 kA). Based on the ANOVA, it was found that the electrode force is a vital parameter in controlling the tensile shear strength as compared to welding time and welding current.

scholarly journals Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3379
Author(s):  
Si On Kim ◽  
Won Seog Yang ◽  
Sung Jin Kim
Keyword(s):  
Corrosion Resistance ◽  
Hot Stamping ◽  
Electrochemical Techniques ◽  
Corrosion Current ◽  
Selective Dissolution ◽  
Localized Corrosion ◽  
Steel Sheets ◽  
Corrosion Behaviors ◽  
Automotive Steel ◽  
Hot Stamping Steel

The effects of the combined addition of Zn and Mg on the corrosion resistance of AlSi-based coating for automotive steel sheets were investigated using a variety of analytical and electrochemical techniques. The preferential dissolution of Mg and Zn from MgZn2/Mg2Si phases occurred on the AlSi-based coating that had been alloyed with a smaller portion of Zn and Mg, which contributed to the rapid surface coverage by corrosion products with a protective nature, reducing the corrosion current density. On the other hand, localized corrosion attacks caused by the selective dissolution of Mg were also observed in the AlSi-based coating with a smaller portion of Zn and Mg. Such alloying can also worsen its corrosion resistance when coated additionally with electrodeposited paint. The mechanistic reasons for these conflicting results are also discussed.

scholarly journals Study the effect of Welding Current on the microstructure and strength of dissimilar weld joint AISI 303/AISI 1008

2021 ◽  
Vol 14 (1) ◽  
pp. 67-75
Author(s):  
Firas Hameed
Keyword(s):  
Mechanical Properties ◽  
Low Carbon Steel ◽  
Welding Current ◽  
Optical Microscope ◽  
Welding Parameters ◽  
Welding Time ◽  
Low Carbon ◽  
Dissimilar Weld ◽  
Steel Aisi ◽  
Joint Quality

The welding of metals is one of the most important processes that require high control for obtaining a good quality of weldments. The joining of dissimilar metals is a more complex operation compared to the joining of similar metals due to the differences in physical metallurgical and mechanical properties. In this article, austenitic stainless steel AISI 303 stud was welded to low carbon steel AISI 1008 plate using arc stud welding (ASW) process. An experimental procedure was applied to estimate the effect of welding parameters namely welding current and welding time on the microstructure and mechanical properties of the joint. The optical microscope V83MC50 was used to show microstructure properties while both the micro-Vickers Hardness and tensile test were adopted to evaluate the mechanical properties. The results revealed that the presence of carbides at the fusion zone FZ towards AISI 303 leads to the maximum value of hardness (501) HV. The best welding parameters were 600 AMP 0.25 second at which joint strength of 515 MPa was recorded. Welding time was the most important parameter in the ASW process followed by welding current, proper selection of welding time, and current welding produces good joint quality

scholarly journals OPTIMIZATION OF THE RESISTANCE SPOT WELDING PROCESS OF SECC-AF AND SGCC GALVANIZED STEEL SHEET USING THE TAGUCHI METHOD

SINERGI ◽  
2021 ◽  
Vol 25 (3) ◽  
pp. 319
Author(s):  
Sukarman Sukarman ◽  
Amri Abdulah ◽  
Apang Djafar Shieddieque ◽  
Nana Rahdiana ◽  
Khoirudin Khoirudin
Keyword(s):  
Shear Strength ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Current ◽  
Galvanized Steel ◽  
Welding Time ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Resistance Spot ◽  
Steel Sheets

This article present the optimization work describes out to joint the dissimilar galvanized steel of SECC-AF (JIS G 3313) and SGCC (JIS G 3302) material. A zinc coating on the surfaces of the galvanized steel sheets will decrease the weldability characteristic of the material. This study used dissimilar galvanised steel sheets to obtain the highest tensile shear strength from the specified resistance spot welding. This research used the Taguchi method with 4-variables and mixed-experimental levels. The mixed-experimental level, namely 2-experimental levels for the first variable and 3-experimental levels for other variables. The highest tensile shear strength was achieved in 5282.13 N. This condition is achieved at a squeezed time of 20 cycles, 27 kA-welding currents, welding time of 0.5 seconds, and holding time of 18 cycles. The S/N ratio analysis has shown the welding current had the most significant effect, followed by welding time, squeeze time, and holding time. The delta values of S/N ratio were 0.79, 0.64, 0.26 and 0.07, respectively. The ANOVA analysis has shown that the P-value of welding current and welding time is 0.006 (0.6%) and 0.015 (1.5%), respectively. This result is expected for optimizing resistance spot welding quality in other materials or significant aspects.

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