scholarly journals Influence of the Process Parameters on the Quality and Efficiency of the Resistance Spot Welding Process of Advanced High-Strength Complex-Phase Steels

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1545
Author(s):  
Gerardo Morales-Sánchez ◽  
Antonio Collazo ◽  
Jesús Doval-Gandoy
Keyword(s):  
Shear Strength ◽  
Frequency Converter ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Welding Parameters ◽  
Resistance Spot ◽  
Welding Equipment ◽  
Advanced High Strength Steels

In this study, the effects of electrical characteristics of an inverter combined with main welding parameters on the resistance spot weldability of advanced high strength steels (AHSS) CP1000 is investigated. The main welding parameters, current and time, were varied. The effects on the geometry and microstructure of the weld spot, the diameter of the weld pad, the hardness, the shear strength, and the efficiency of the process were studied, and the results were compared for two switching frequencies of the medium frequency converter. Furthermore, the weldability lobes were obtained as a function of the shear strength, for both frequencies. This work shows that the quality of the welding, in the established terms, is better when a lower frequency is used, even though the parameterization of the welding equipment can be easier for higher frequencies.

MIG-Welding of Dissimilar Advanced High Strength Steel Sheets

2017 ◽  
Vol 885 ◽  
pp. 80-85 ◽  
Author(s):  
Eszter Kalácska ◽  
Kornél Májlinger ◽  
Enikő Réka Fábián ◽  
Pasquale Russo Spena
Keyword(s):  
Automobile Industry ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Tensile Specimen ◽  
Dissimilar Welding ◽  
Welding Parameters ◽  
Mig Welding ◽  
Advanced High Strength Steels ◽  
Steel Sheets

The need for steel materials with increasing strength is constantly growing. The main application of such advanced high strength steels (AHSS) is the automobile industry, therefore the welding process of different types of AHSSs in dissimilar welding joint was investigated. To simulate the mass production of thin steel sheet constructions (such as car bodies) automated metal inert gas (MIG) welding process was used to weld the TWIP (twinning induced plasticity) and TRIP (transformation induced plasticity) steel sheets together. The welding parameters were successfully optimized for butt welded joints. The joints were investigated by visual examination, tensile testing, quantitative metallography and hardness measurements. The TRIP steel side of the joints showed increased microhardness up to (450-500 HV0.1) through increased fraction of bainite and martensite. Macroscopically the tensile specimen showed ductile behaviour, they broke in the austenitic weld material.

Pulsed LASER-(Micro) TIG Welding of Automotive Zn Coated Advanced High Strength Steels Thin Sheets in Overlap Configuration

2014 ◽  
Vol 1029 ◽  
pp. 182-187 ◽  
Author(s):  
Aurel Valentin Bîrdeanu
Keyword(s):  
Shear Strength ◽  
Process Parameters ◽  
Strong Interaction ◽  
Pulsed Laser ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Joint Gap ◽  
New Process

The wider implementation into automotive sector of new materials categorized as Advanced High Strength Steels (AHSS) in order to reduce costs and weight require the development of appropriate joining technologies. The paper presents the results of applying of a new hybid welding process, i.e. Pulsed LASER-(micro)TIG, for realizing overlap joints for Zn-coated AHSS materials. The statistical influence of main hybrid welding process parameters was investigated by means of factorial experimental design and weighted against the shear strength results of the realized joints. The influence of laser pulse peak power, the average welding TIG current and the joint gap was investigated for three types of Zn coated AHSS with different thicknesses. The results revealed that sane joints could be obtained with the new welding process and that the new process is fit to be applied for these materials. Each material did behave different in respect to the investigated process parameters and the results did reveal rather strong interaction between the influence factors (IF), however the joint gap does play an important role in respect to the maximum shear strength of the joint, which could be correlated to the specifics of the laser beam welding of Zn coated steels. The strong interaction between the studied IF imply further study of the new process by including other process parameters.

Shear Strength Variation for PLmT Welded Zn Coated Advanced High Strength Steels Used in Automotive Structures in Overlap Configuration

2015 ◽  
Vol 1111 ◽  
pp. 205-210
Author(s):  
Aurel Valentin Bîrdeanu
Keyword(s):  
Shear Strength ◽  
Laser Pulse ◽  
Process Parameters ◽  
Influence Factors ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Strong Interactions ◽  
Hybrid Welding ◽  
Advanced High Strength Steels

The paper presents the results of applying of a new hybrid welding process, i.e. Pulsed LASER-(micro)TIG (PLmT), for realizing overlap joints for Zn-coated U/AHSS thin sheets materials, used in the automotive industry for realizing car structures. The statistical influence onto the joint’s shear strength (objective function) of three hybrid welding process parameters was investigated by means of experimental design and weighted. The influence of laser pulse peak power, the average welding TIG current and the laser pulse duration was investigated for two types of Zn coated U/AHSS used in car body realization. The results revealed that the new process can be applied for the investigated materials and that joints with appropriate shear strength values can be obtained. Each combination did behave rather different in respect to the investigated process parameters and the results did reveal that rather strong interactions are in place between the influence factors (IF) for CPW 800 material. The determined models can be used to select convenient process parameters combinations in respect to minimum Zn coating damage and proper shear strength of the joints for each of the studied materials.

scholarly journals Effect of Microstructure and Texture on Mechanical Properties of Resistance Spot Welded High Strength Steel 22MnB5 and 5A06 Aluminium Alloy

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 685
Author(s):  
Xiaoqing Jiang ◽  
Shujun Chen ◽  
Jinlong Gong ◽  
Zhenyang Lu
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Aluminium Alloy ◽  
High Strength Steel ◽  
High Strength ◽  
Welding Parameters ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Resistance Spot ◽  
Effect Of Microstructure

The present study aims to investigate the effect of microstructure and texture on mechanical properties of resistance spot welding of high strength steel 22MnB5 and 5A06 aluminium alloy as a function of welding parameters. The pseudo-nugget zones (NZs) at the steel side have undergone full recrystallisation with a fine-grained ferrite structure containing a small amount of retained austenite and a high hardness of approximately 500 HV, which is a 35% increase in hardness compared to the base material (BM) with fine lath martensitic structure. The NZs at the Al side contain both a recrystallisation texture and shear texture. Higher tensile shear strength with increasing weld time could be linked to the random texture at the Al side. The highest tensile shear strength was achieved at an intermetallic layer thickness of 4 mm.

Pulsed LASER-(Micro)TIG Welding of Automotive Dissimilar Zn-Coated Advanced High Strength Steels Thin Sheets in Overlap Configuration

2016 ◽  
Vol 1138 ◽  
pp. 147-152
Author(s):  
Aurel Valentin Bîrdeanu
Keyword(s):  
High Performance ◽  
Pulsed Laser ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Industrial Applications ◽  
Cost Ratio ◽  
Hybrid Welding ◽  
Thin Sheets ◽  
Advanced High Strength Steels

The development and implementation into a high number of industrial applications of materials categorized as (Advanced) High Strength Steels (AHSS) due to their high performance per cost ratio is more and more present and this trend is also combined with the development and implementation of new joining technologies and processes, including laser-arc hybrid processes.The paper presents the results of applying Pulsed LASER-(micro)TIG hybrid welding process, for realizing overlap joints for Zn-coated (A)HSS materials in dissimilar configurations, joints that were presented as designed based on UltraLight Steel Auto Body (ULSAB) principles.The influence of main hybrid welding process parameters was investigated in order to establish if one can obtain joints with high values for the shear strength resistance for some of the actually used dissimilar steel combinations based on designs applied throughout ULSAB project and the autos built following these principles.

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