scholarly journals PARAMETRIC STUDY OF MULTI-SPOT WELDED LAP SHEAR SPECIMEN FOR TENSILE AND SHEAR STRENGTH

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Kisanlal B. Badole ◽  
Dr. P. G. Mehar
Keyword(s):  
Shear Strength ◽  
Testing Machine ◽  
Sheet Thickness ◽  
Welding Current ◽  
Shear Loading ◽  
Galvanized Steel ◽  
Steel Sheets ◽  
Shear Specimen ◽  
Lap Shear ◽  
Weld Time

The effect of number of spots, spot spacing, squeezing force, welding current, weld time, overlapping length and sheet thickness on the tensile and shear strength of two similar galvanized steel sheets are investigated through experiments using RSM method and by using software. Similar sheets of galvanized steel sheets are made by resistance spot welding at different processing conditions and these joint populations were tested under lap-shear loading conditions. Specially fabricated fixture is used to load the lap shear specimen in the universal testing machine Regression analysis is done to obtain relationship between shear strength and selected parameters. The experimental results indicate that the failure loads of spot welds in lap-shear specimens increase when number of spot, squeezing force, welding current and sheet thickness increase for the given ranges

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.

Weld bonding process analysis for tensile shear strength and peel strength of weld bonded joints of dissimilar steel sheets

2018 ◽  
Vol 233 (4) ◽  
pp. 709-717
Author(s):  
L Boriwal ◽  
RM Sarviya ◽  
MM Mahapatra
Keyword(s):  
Shear Strength ◽  
Joint Strength ◽  
Welding Current ◽  
Peel Strength ◽  
Bonded Joints ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Weld Bonding ◽  
Steel Sheets ◽  
Weld Time

Evaluating the strength performance of resistance spot welded joints in dissimilar material is critical for their continued integration into the automobile and aerospace industries. The effect of joint strength is an important consideration in the design of welded structures. The aim of this paper is to evaluate the effect of the welding process parameters (welding current, weld time, and electrode pressure) on the mechanical performance of dissimilar weld bonds between austenitic stainless steel 304L and low carbon steel sheets. Mechanical properties of weld bonds are described in terms of bond strength, failure mode, and hardness of the joint. Weld bonding experiments were planned on the basis of full factorial design matrix. Weld bonded joint strength tests showed that the maximum tensile shear strength and peel strength were achieved at 6.4 kA, eight-cycle weld time with 3 kg/cm2 electrode pressure. The hardness value across the weld bonded fusion zone was not affected much with respect to varying the welding current. Pullout failure and tearing failure modes were observed during the tensile shear strength test of weld bonded joints. Application of adhesive layer at faying surfaces resulted not only in strengthening but also distributing the stress in weld bonded joints.

Tensile and shear strength for a self-drilling screw and transition of failure-modes and shear-strengths for self-drilling screwed connections at elevated-temperatures

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fuminobu Ozaki ◽  
Ying Liu ◽  
Kai Ye
Keyword(s):  
Shear Strength ◽  
Test Temperature ◽  
Failure Modes ◽  
Elevated Temperatures ◽  
High Strength ◽  
Shear Loading ◽  
The Self ◽  
Content Type ◽  
Steel Sheets ◽  
Loading Tests

PurposeThe purpose of this study is to clarify both tensile and shear strength for self-drilling screws, which are manufactured from high-strength, martensitic-stainless and austenitic stainless-steel bars, and the load-bearing capacity of single overlapped screwed connections using steel sheets and self-drilling screws at elevated temperatures.Design/methodology/approachTensile/shear loading tests for the self-drilling screw were conducted to obtain basic information on the tensile and shear strengths at elevated temperatures and examine the relationships between both. Shear loading tests for the screwed connections at elevated temperatures were conducted to examine the shear strength and transition of failure modes depending on the test temperature.FindingsThe tensile and shear strengths as well as the reduction factors at the elevated temperature for each steel grade of the self-drilling screw were quantified. Furthermore, either screw shear or sheet bearing failure mode depending on the test temperature was observed for the screwed connection.Originality/valueThe transition of the failure modes for the screwed connection could be explained using the calculation formulae for the shear strengths at elevated temperatures, which were proposed in this study.

Behaviour of adhesive-bonded assemblies of galvanized steel sheets under shear loading

1986 ◽  
Vol 6 (2) ◽  
pp. 67-71 ◽  
Author(s):  
E. Ziane ◽  
G. Beranger ◽  
C. Coddet ◽  
J.C. Charbonnier
Keyword(s):  
Shear Loading ◽  
Galvanized Steel ◽  
Steel Sheets

A design of a new miniature device for solder joints’ mechanical properties evaluation

2016 ◽  
Vol 231 (20) ◽  
pp. 3818-3830 ◽  
Author(s):  
Quang-Bang Tao ◽  
Lahouari Benabou ◽  
Laurent Vivet ◽  
Ky-Lim Tan ◽  
Jean-Michel Morelle ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Strain Rate ◽  
Solder Joints ◽  
Testing Machine ◽  
Testing Temperature ◽  
Material Behavior ◽  
Shear Strain Rate ◽  
Solder Alloys ◽  
Lap Shear

This paper makes a focus on the design of a micro-testing machine used for evaluating the mechanical properties of solder alloys. The different parts of the testing device have been developed and assembled in a manner that will facilitate the study of miniature solder joints as used in electronic packaging. A specific procedure for fabricating miniature lap-shear joint specimens is proposed in this work. The tests carried out with the newly developed machine serve to determine the material behavior of solder joints under different controlled loading and temperature conditions. Two new solder alloys, namely SACBiNi and Innolot, are characterized in the study, showing the influence of strain rate and temperature parameters on their respective mechanical responses. In addition, the as-cast and fracture surfaces of the solder joints are observed with a scanning electron microscope to reveal the degradation mechanisms. The SACBiNi solder alloy, which contains less Ni and Sb elements, is found to have smaller shear strength than the Innolot alloy, while its elongation to rupture is significantly improved at the same strain rate level and testing temperature. The highest shear strength is 58.9 MPa and 61.1 MPa under the shear strain rate of 2.0 × 10−2 s−1 and room temperature for the SACBiNi and Innolot solder joints, respectively. In contrast, the lowest shear strength values, 26.6 MPa and 29.5 MPa for SACBiNi and Innolot, respectively, were recorded for the strain rate value of 2.0 × 10−4 s−1 and at temperature of 125℃.

Effect of Spot Welding Current and Cycles on the Mechanical Properties of Welded Galvanized Steel Sheets

2013 ◽  
Vol 795 ◽  
pp. 87-90 ◽  
Author(s):  
Shamsul Baharin Jamaludin ◽  
Mohd Noor Mazlee ◽  
Muhammad Rifki Ismail ◽  
Khairel Rafezi Ahmad ◽  
Kamarudin Hussin
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Welding Process ◽  
Welding Current ◽  
Galvanized Steel ◽  
Shear Load ◽  
Tensile Shear ◽  
Steel Sheets ◽  
Welding Cycle

Studies on the effects of welding current and cycles were carried on the galvanized steel sheets using spot welding. The welding currents used were 3 kA, 5 kA 6 kA and the welding cycles were 4, 6 and 8. Tensile shear and tensile peel load were determined on the joint of welded specimens. The results showed that the value of tensile shear load was lower than tensile peel load. The strength of the joint increased with the increasing of welding current and welding cycle used in the welding process.

On the Shear Strength and Mixed-mode Fracture Toughness of a Lead-Tin and a Tin-Silver Solder

1998 ◽  
Vol 515 ◽  
Author(s):  
M. Manoharan ◽  
K. S. SIOW ◽  
M. W. WEISER
Keyword(s):  
Shear Strength ◽  
Mixed Mode ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Bulk Solder ◽  
Shear Loading ◽  
Mixed Mode Fracture ◽  
Traditional Role ◽  
Mode Fracture ◽  
Lap Shear

ABSTRACTThe increasing demands on solder joints have made it imperative that they perform not only their traditional role of electrical connection but also possess good mechanical integrity. One such key mechanical property is the shear strength of the solder. A number of specimen geometries can be used to evaluate the shear strength of solders, each with its advantages and limitations. This study uses a modified double lap shear geometry to measure the shear strength of the solders as a function of strain rate. It is ahown that the shear strength measured this way is truly reflective of the complex composite formed by the copper, solder and intermetallics and may be more representative of actual conditions of use rather than measurements of the shear strengths of the bulk solder. The study also uses a modified compact tension specimen to measure the fracture of the solder under combined tensile-shear loading conditions. It is shown that the solder fracture under these conditions follows the general principles of a mixed-mode fracture mechanism map.

scholarly journals CONVERSION FACTORS OF THE TEMPERATURE EFFECT ON THE SHEAR STRENGTH OF ADHESIVELY-BONDED STEEL JOINTS

2016 ◽  
Vol 22 (5) ◽  
pp. 666-672 ◽  
Author(s):  
Hartmut PASTERNAK ◽  
Samer SAHELLIE
Keyword(s):  
Shear Strength ◽  
Evaluation Method ◽  
Galvanized Steel ◽  
Adhesively Bonded ◽  
Short Term ◽  
Limit States ◽  
Direct Evaluation ◽  
Conversion Factors ◽  
Lap Shear ◽  
Steel Joints

This paper presents the investigations on lap shear galvanized steel joints bonded by two structural adhesives (acrylic and epoxy) with two thicknesses of the bondline. The effect of the temperature on the shear strength of the ad­hesives when the joints are short-term-loaded is the main objective of the investigations. The partial factors of the limit states as well as the conversion factors that cover the use conditions and circumstances and particularly the temperature influence, within a temperature range from –20 °C to +40 °C, are proposed. These factors are proposed by two methods commonly used in the respective standards; the direct evaluation method and prediction model-based method. A com­parison between the results obtained by these methods is presented.

Evaluating weld properties of conventional and swept friction stir spot welded 6061-T6 aluminium alloy

2019 ◽  
Vol 9 (8) ◽  
pp. 851-860 ◽  
Author(s):  
S. Suresh ◽  
K. Venkatesan ◽  
Elango Natarajan ◽  
S. Rajesh ◽  
Wei Hong Lim
Keyword(s):  
Shear Strength ◽  
Aluminium Alloy ◽  
Rotational Speed ◽  
Shear Fracture ◽  
Shear Loading ◽  
Tool Rotational Speed ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Lap Shear ◽  
Weld Properties

6061-T6 aluminium alloy is a tempered grade aluminium material that is extensively used, particularly in space and automotive applications. The conventional and swept friction stir spot welding (FSSW) joints are prepared by varying tool rotational speed at four different levels. The mechanical properties, microstructure and mode of failure in both types of FSSW are evaluated and reported. The high plastic deformation and fine grains influenced the increase in hardness of the weld joints based on the Hall-Petch equation. The highest lap shear strength of 5.31 kN is observed in swept FSSW sample prepared at 1400 rpm. Interestingly, 1600 rpm decreased the lap shear strength due to insufficient friction between base metal and tool in the higher tool rotational speed. The minimum microhardness is noticed in heat-affected zone (HAZ) of both cases. Conventional FSSW samples showed shear fracture, nugget pullout fracture and circumferential fracture under lap shear loading, whereas swept FSSW showed only the circumferential fracture.

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