scholarly journals Welding Time Effect of Welding Joints in Micro Alloyed and TRIP 800 Steels in Resistance Spot Welding

2017 ◽  
Vol 131 (3) ◽  
pp. 389-392 ◽  
Author(s):  
V. Onar ◽  
S. Aslanlar
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Time Effect ◽  
Welding Time ◽  
Resistance Spot ◽  
Welding Joints

scholarly journals Quality Prediction of Resistance Spot Welding Joints From Pre- and Post-Welding Inputs Using Stacking of Tree Ensemble Models

2021 ◽  
Author(s):  
Óscar Martín ◽  
Virginia Ahedo ◽  
José Ignacio Santos ◽  
José Manuel Galán
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Characteristic Curve ◽  
Welding Process ◽  
Quality Level ◽  
Ensemble Models ◽  
Resistance Spot ◽  
Single Output ◽  
Combined Use ◽  
Welding Joints

Abstract Resistance spot welding (RSW) is a widespread manufacturing process in the automotive industry. There are different approaches for assessing the quality level of RSW joints. Multi-input-single-output methods, which take as inputs either the intrinsic parameters of the welding process or ultrasonic nondestructive testing variables, are commonly used. This work demonstrates that the combined use of both types of inputs can significantly improve the already competitive approach based exclusively on ultrasonic analyses. The use of stacking of tree ensemble models as classifiers dominates the classification results in terms of accuracy, F-measure and area under the receiver operating characteristic curve metrics. Through variable importance analyses, the results show that although the welding process parameters are less relevant than the ultrasonic testing variables, some of the former provide marginal information not fully captured by the latter.

scholarly journals Resistance Spot Welding of SUS316L Austenitic/SUS425 Ferritic Stainless Steels: Weldment Characteristics, Mechanical Properties, Phase Transformation and Solidification

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 710 ◽  
Author(s):  
Khuenkaew ◽  
Kanlayasiri
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Stainless Steels ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Lap Joints ◽  
Welding Time ◽  
Welding Condition ◽  
Resistance Spot ◽  
Weld Current

This research examines the weldment characteristics and mechanical properties of lap joints of SUS316L/SUS425 stainless steels using resistance spot welding under variable weld currents and welding times. The weld current was varied between 7.0, 8.5, and 10.0 kA, and the welding time between 25, 38, and 50 cycles. The weldment quality characteristics under study were the depth of fusions, indentation depths, and nugget diameter, and the mechanical properties included the tensile shear force (TSF) and micro Vickers hardness. Phase transformation and solidification were characterized using scanning electron microscopy and energy dispersive X-ray spectrometry, together with Schaeffler and pseudo-binary predictive phase diagrams. The results revealed that the weldment quality was positively correlated with weld current and welding time, as were the TSF and micro hardness. The optimal welding condition was achieved under a 10.0 kA weld current and 25-cycle welding time. Under the optimal condition, the fusion zone exhibited compression-direction columnar grains consisting of austenite, ferrite, and martensite and the solidification was of ferrite plus Widmanstatten austenite.

scholarly journals STUDI LITERATUR PENGARUH PARAMETER PENGELASAN TERHADAP SIFAT FISIK DAN MEKANIK PADA LAS TITIK (RESISTANCE SPOT WELDING)

ROTASI ◽  
2013 ◽  
Vol 15 (2) ◽  
pp. 44
Author(s):  
Haikal Haikal ◽  
Triyono Triyono
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Electric Current ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Dissimilar Materials ◽  
Dissimilar Metals ◽  
Welding Time ◽  
Resistance Spot ◽  
Nugget Diameter

Resistance spot welding (RSW) is the most widely used for joining thin sheet metals in automotive industry. Various applications of dissimilar materials and thicknesses were commonly found in many spot welding processes especially in the manufacture of car body. The resistance spot welding of dissimilar materials are generally more challenge than similar materials due to differences in the physical, chemical, and mechanical properties of the base metals. Differences of materials have an impact on heat input generated at the spot welding. Diameter of the weld nugget size is influenced by several parameters such as electric current, welding time, different types of material, and the thickness of the plate. Nugget diameter will influence on physical and mechanical properties weld such as microstructure, shear strength and hardness. For practical use, various industrial standards have recommended a minimum weld size for a given sheet thickness, mostly in the form of tables. For example the American Welding Society (AWS), Society of Automotive Engineering (SAE) and the American National Standards Institute (ANSI). They were only suitable to be apllied on the similar metal and thickness joint because in this joint, symetrical nugget will be formed. Meanwhile a type of dissimilar metal that joined by spot welding method will result in the asymetrical nugget. This paper aims to review the results of researchs on the similar and dissimilar resistance spot welded joint to evaluate the use of similar metals weld parameters and standards on the dissimilar metals weld. It was determined that parameters welding such as electric current, welding time, and the standard for similar metals weld can not be applied on the dissimilar metals weld. The asymetrical nugget shape decreased shear strength on the weld nugget. The most important factor that was considered on the dissimilar metals weld to make high quality weld joint was nugget diameter. If the nugget diameter weld increased the strength of welding will increase.

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