Gas Metal Arc Welding of Thermo-Mechanically Controlled Processed S960MC Steel Thin Sheets with Different Welding Parameters

The Friction stir welding (FSW) is a complex process, depending on many factors: machine, clamping device, material and tools. Parameters that have a direct impact on the quality of the joint include the rotational speed, welding speed, clamping force, geometry and tool plunging depth. The paper presents the results of experimental studies concerning the effect of tool pin length on the microstructure and mechanical strength of joints of thin sheets made of Al 7075 alloy. A tool with an adjustable pin with concave shoulder was used to weld the joints. Different pin lengths were used, which were selected with respect to the thickness of the welded joint. The specimens were subjected to visual evaluation, metallographic tests and mechanical strength testing. The results indicate that the pin length has a decisive effect on the microstructural changes in the joint and thus influencing the strength of the FSW joints.

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“…case of the MIG, TIG and plasma welding, good joint quality depends on cca. 13, 15 and 24 parameters, respectively [11][12][13].…”

Section: Effect Of Tool Pin Length On Microstructure and Mechanical Strength Of The Fsw Joints Of Al 7075 Metal Sheetsmentioning

confidence: 99%

Effect of Tool Pin Length on Microstructure and Mechanical Strength of the FSW Joints of Al 7075 Metal Sheets

Wrońska¹,

Andres²,

Altamer³

et al. 2019

Komunikácie

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“…Moreover, in the case of the last connection methods, the sub-components used for the joining have certificates, while the quality of the first one depends on the qualifications of the welding group. This problem is considered by a lot of research teams [ 9 , 14 ], which examined parameters of the joining technique or modified ones applying additional sub-elements such as micro-jet cooling device [ 15 , 16 ] or hybrid welding process [ 17 , 18 ]. These efforts are transferred for various kinds of high-strength steel focusing on the S960MC [ 15 , 17 , 18 ], which is an attractive kind of metal because it is produced in a lot of forms such as sheets, tubes and plates [ 1 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Weld to S960MC High Strength Steel from Joining Process at Micro-Jet Cooling with Critical Parameters under Static and Fatigue Loading

et al. 2021

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The paper is focused on testing the weld of the S960MC steel produced at the micro-jet cooling under static and fatigue loading at critical parameters. This kind of material was in the form of a sheet with a thickness equal to 2 mm. The joint was obtained using three different types of welding wires: EDFK 1000, Union NiMoCr and Union X96 at the same parameters of the process. The joints were examined using non-destructive and destructive tests. The results from non-destructive experiments enable us to assess the quality of the welds directly before the joining process. In contrast, the destructive one allows following welds behavior under different loading conditions with their critical parameters. The bending experiments confirmed the good plastic properties of the weld, expressed by no cracks in the region tested in many variants of the joint manufactured. The results from static tests indicated a significant reduction of mechanical parameters of the weld in comparison to the base metal, expressed by 50% differences. Fatigue data have enabled us to follow the welding behavior at the increasing amplitude of axial stress up to fracture at constant amplitude value covering the following values of stress 650 MPa–100 MPa. Variations of total energy are presented at different values of several cycles up to fracture. Fracture regions are collected for analysis of the joint region features under cyclic loading. They have indicated differences in weld cracking depended on the stress level. Finally, the Wöhler S-N curve of the weld was determined, indicating the value of the fatigue limit of the weld tested, i.e., 100 MPa. The weld at the Union NiMoCr welding wire was indicated as the joint having the highest resistance on static and fatigue loadings.

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“…The methodology for determining the width of the soft zone varies depending on the author of the study. Some works consider the whole HAZ as a soft zone [4,10,16]. After evaluation of the tensile tests, the fracture always appeared in the ICHAZ or SCHAZ areas.…”

Section: Soft Zone Propertiesmentioning

confidence: 99%

“…Depending on the temperature reached, softening is divided into transformation softening (if the temperature has exceeded Ac1) and tempering softening (below Ac1) [8,14]. The phenomenon of softening has been the subject of several studies, which include excess heat input and a low cooling rate as the key issues of the decrease in strength [9,[14][15][16][17][18][19][20][21][22]23]. With an increasing maximum temperature and a decreasing cooling rate, changes in the HAZ properties are more pronounced.…”

Section: Introductionmentioning

confidence: 99%

“…For individual purposes, this decrease in strength is often accepted, but it should be noted that there is an inefficient use of the base material properties. The use of gas metal arc welding (GMAW) for welding high-strength TMCP steel with a variable heat input can be observed in the work of Jambor et al [16]. By decreasing the heat input, a slight improvement in strength was achieved, which, however, still did not reach the values of the base material.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Welding Parameters and Filler Material on the Mechanical Properties of HSLA Steel S960MC Welded Joints

Mičian

Frátrik

Kajánek

2021

Metals

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This article provides an overview of the influence of welding parameters and filler material on changes in the heat-affected zone (HAZ) of thermo-mechanically controlled processed (TMCP) steel welded joints. The research focused on evaluating the effect of heat input and cooling rate on the width of the soft zone, which significantly affects the mechanical properties of welded joints. The negative effect of the soft zone is more pronounced as the thickness of the material decreases. Therefore, the object of this research was a 3-mm-thick sheet of S960MC steel welded by gas metal arc welding (GMAW) and metal-cored arc welding (MCAW) technology. Variable welding parameters were reflected in different heat input and cooling rate values, which led to a change in the properties of the HAZ and thus the mechanical properties of the welded joints. The changes in the HAZ were analyzed by microscopic analysis and mechanical testing. The measured results showed a significant effect of heat input on the cooling rate, which considerably affected the width of the soft zone in the HAZ and thus the overall mechanical properties of the welded joints.

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Gas Metal Arc Welding of Thermo-Mechanically Controlled Processed S960MC Steel Thin Sheets with Different Welding Parameters

Cited by 12 publications

References 20 publications

Effect of Tool Pin Length on Microstructure and Mechanical Strength of the FSW Joints of Al 7075 Metal Sheets

Effect of Tool Pin Length on Microstructure and Mechanical Strength of the FSW Joints of Al 7075 Metal Sheets

Behavior of Weld to S960MC High Strength Steel from Joining Process at Micro-Jet Cooling with Critical Parameters under Static and Fatigue Loading

Influence of Welding Parameters and Filler Material on the Mechanical Properties of HSLA Steel S960MC Welded Joints

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