Characteristics of CO2 Laser Welded TRIP Steel Sheet

2011 ◽  
Vol 189-193 ◽  
pp. 3764-3767
Author(s):  
Wen Quan Wang ◽  
Shi Ming Huang ◽  
Qun You ◽  
Chung Yun Kang
Keyword(s):  
Tensile Strength ◽  
Weld Metal ◽  
Welding Speed ◽  
Steel Plate ◽  
Welded Joint ◽  
Raw Material ◽  
Maximum Hardness ◽  
Transformation Induced Plasticity ◽  
Trip Steel Sheet ◽  
Lower Elongation

Characteristics of CO2 laser welded 1000 MPa grade Transformation Induced Plasticity steel plate were investigated under different welding power, welding speed and shield gas. Decreasing welding power, increasing welding speed or using mixed shield gas (Ar+He) all reduced the porosity in the weld metal (WM). The weld metal and HAZ near the WM had maximum hardness. In tensile strength test of load perpendicular to the weld axis, the specimens had same tensile properties as that of the raw material. For the load parallel with the weld axis, the specimens prepared with Ar had equal yield strength (YS) and tensile strength (TS) to that of the raw material. But the elongation was lower than that of the raw material. The specimens prepared with shield gas He had higher YS, TS and lower elongation compared with that of the raw material. The welded joint had lower formability than that of the raw material. The formability of specimens prepared with low welding power or mixed shield gas Ar+He was improved compared with that of the specimens prepared using high power or single shield gas Ar.

Characteristics of CO2 Laser Welded 800MPa Grade TRIP Steel

2004 ◽  
Vol 449-452 ◽  
pp. 409-412 ◽  
Author(s):  
Tae Kyo Han ◽  
Ki Heok Kim ◽  
Byoung Ik Kim ◽  
Chung Yun Kang ◽  
In Su Woo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Weld Metal ◽  
Tensile Test ◽  
Base Metal ◽  
Welding Speed ◽  
Trip Steel ◽  
Raw Material ◽  
Maximum Hardness ◽  
Tensile Direction

The effect of welding conditions on defects, microstructure, mechanical properties and formability of CO2welded 800MPa grade TRIP steel was investigated. Bead-on-plate welding was carried out under the various welding speed in 6kW with a shield gas of Helium. Extensive porosity was observed in the joints produced at a 4m/min of welding speed but was not observed in the joints when a welding speed greater than 6m/min was used. The maximum hardness was obtained at the weld metal and the HAZ near the weld metal and was the same regardless of the welding speed. The HAZ hardness near the base metal was reduced due to retained ferrite but was higher than that of the base metal. In a parallel tensile test to weld axis, the strength of the joints was higher than that of the base metal. Elongation was found to be lower than that of the raw material because a crack was initiated in the bead at the strength levels corresponding to the tensile strength of the base metal and was propagated perpendicular to tensile direction. The formability of joints was found to be 63% that of the raw material.

scholarly journals Pemanfaatan limbah piston bekas sebagai filler metal aluminium pada pengelasan oxy-acetylene

2017 ◽  
Vol 7 (2) ◽  
Author(s):  
Z. Nurisna
Keyword(s):  
Tensile Strength ◽  
Weld Metal ◽  
Filler Metal ◽  
Welded Joint ◽  
Cooling Water ◽  
Welding Process ◽  
Raw Material ◽  
Porosity Defects ◽  
Si Content ◽  
Test Loading

The abundance of waste piston used so far has not been utilized properly. Users of this piston waste can be used as an oxy-acetylene welder filler. Las oxy-acetylene has been widely used for welding on various types of aluminum product repair, one of which is welding machine block. Machine blocks in their use often suffered damage to the cooling water circulation path and broken crack and broken. Welders and repair shops that repair these damages do not have standardized standards in the use of weld fillers, but they do filler selection based solely on experience including in determining the weld filler. The purpose of this research is to know the effect of piston waste which is used as raw material of weld filler to tensile strength and hardness of welded block result of machine using oxy-acetylene welding. Welding is done by an experienced welder. The welding results are tested for tensile strength and hardness distribution test. The welded joint with the chemical composition of filler which is almost equal to base metal has the highest tensile strength. The tensile strength of the welded joint tension test is in the weld metal region due to defects in the weld metal, especially the porosity defects that are formed during the welding process so that the tensile test loading is concentrated on the defect. While the highest hardness on the weld is in the filler metal with the highest percentage of Si content.

Enhancements on dissimilar friction stir welding between AZ31 and SPHC mild steel with Al-Mg as powder additives

2021 ◽  
pp. 1-22
Author(s):  
Mohd Ridha Muhamad ◽  
Sufian Raja ◽  
Mohd Fadzil Jamaludin ◽  
Farazila Yusof ◽  
Yoshiaki Morisada ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Mild Steel ◽  
Welding Speed ◽  
Welded Joint ◽  
Microstructural Analysis ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Friction Stir ◽  
Welding Interface

Abstract Dissimilar materials joining between AZ31 magnesium alloy and SPHC mild steel with Al-Mg powder additives were successfully produced by friction stir welding process. Al-Mg powder additives were set in a gap between AZ31 and SPHC specimen's butt prior to welding. The experiments were performed for different weight percentages of Al-Mg powder additives at welding speeds of 25 mm/min, 50 mm/min and 100 mm/min with a constant tool rotational speed of 500 rpm. The effect of powder additives and welding speed on tensile strength, microhardness, characterization across welding interface and fracture morphology were investigated. Tensile test results showed significant enhancement of tensile strength of 150 MPa for 10% Al and Mg (balance) powder additives welded joint as compared to the tensile strength of 125 MPa obtained for welded joint without powder additives. The loss of aluminium in the alloy is compensated by Al-Mg powder addition during welding under a suitable heat input condition identified by varying welding speeds. Microstructural analysis revealed that the Al-Mg powder was well mixed and dispersed at the interface of the joint at a welding speed of 50 mm/min. Intermetallic compound detected in the welding interface contributed to the welding strength.

Microstructures and Mechanical Properties of Welded Joints of Several High Tensile Strength Steel

2018 ◽  
Vol 941 ◽  
pp. 224-229
Author(s):  
Takahiro Izumi ◽  
Tatsuya Kobayashi ◽  
Ikuo Shohji ◽  
Hiroaki Miyanaga
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Weld Metal ◽  
Welded Joints ◽  
Welded Joint ◽  
Steel Plates ◽  
Fatigue Properties ◽  
High Tensile Strength ◽  
The Matrix ◽  
Microstructures And Mechanical Properties

Microstructures and mechanical properties of lap fillet welded joints of several high and ultra-high tensile strength steel by arc welding were investigated. Steel plates having tensile strength of 400 (SPH400W), 590 (SPC590Y, SPC590R), 980 (SPC980Y) and 1500 MPa (SAC1500HP) class with 2 mm thickness were prepared. Four types of joints were formed by MAG welding; SPH400W/SPH400W, SPC590Y/SPC590Y, SPC980Y/SPC980Y and SAC1500HP/SPC590R. In joints with SPC590Y, SPC980Y and SAC1500HP steel which matrixes are martensitic microstructures, the HAZ softens due to transformation of martensite into ferrite with precipitating cementite. By using high and ultra-high tensile strength steel, the weld metal is strengthened due to dilution of the matrix into the weld metal and thus tensile shear strength of the welded joint increases. In the fatigue test, similar S-N diagrams were obtained in the all welded joints investigated. It seems that the effect of stress concentration due to the shape of the welded joint on fatigue properties is larger than that of the strength of the matrix.

Effect of Softening on Tensile Strength Limit in Girth-Welded Pipe Joints

2009 ◽  
Author(s):  
Houichi Kitano ◽  
Shigetaka Okano ◽  
Masahito Mochizuki
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Weld Metal ◽  
Welded Joint ◽  
Fe Analysis ◽  
Strength Limit ◽  
Theoretical Approaches ◽  
Soft Interlayer ◽  
Pipe Joints ◽  
Welded Pipe

This paper discusses the ultimate tensile strength of girth-welded pipe joints with one or more soft interlayers, as determined by theoretical approaches and FE analysis. In FE analysis, the soft interlayer is assigned to be either the weld metal or heat-affected zone (HAZ). Based on the results of the FE analysis, an evaluation formula is proposed for the ultimate tensile strength of a welded joint including the soft interlayer.

Characteristics of Nd:YAG Laser Welded 600MPa Grade TRIP and DP Steels

2007 ◽  
Vol 539-543 ◽  
pp. 3967-3972 ◽  
Author(s):  
Chung Yun Kang ◽  
Tae Kyo Han ◽  
Bong Keun Lee ◽  
Jeong Kil Kim
Keyword(s):  
Tensile Test ◽  
Base Metal ◽  
Welding Speed ◽  
Nd:Yag Laser ◽  
Raw Materials ◽  
Weld Line ◽  
Raw Material ◽  
Maximum Hardness ◽  
Dp Steel ◽  
The Difference

The characteristics of Nd:YAG laser welded 600MPa grade TRIP(transformation induced plasticity) and DP(dual phase) steels with respect to hardness, microstructures, mechanical properties and formability was investigated. A shielding gas was not used, and bead-on-plate welding was performed using various welding speeds at a power of 3.5kW. In the case of TRIP steel, the hardness was the highest at the fusion zone(FZ) and HAZ near the FZ and decreased as the base metal was approached. The maximum hardness increased with increasing welding speed to 3.6m/min and then remained. The microstructures of FZ and HAZ near the FZ consisted of ferrite and bainite for all welding speeds. In the case of DP steel, the maximum hardness was obtained at the HAZ near the FZ. It increased rapidly to 2.1m/min and then showed nearly the same value. The difference between the maximum hardness of HAZ and that of FZ increased with decreasing welding speed. The microstructure of FZ was composed of acicular ferrite but the HAZ near the FZ contained bainite and ferrite at a low welding speed. Both steels had similar tensile properties and formabilities. In a perpendicular tensile test to the weld line, all specimens were fractured at the base metal, and the strengths were somewhat higher than those of raw metals. In a parallel tensile test, the strengths of the joints were higher than those of raw materials but the elongations were lower. Formability was determined to be approximately 80% as compared with raw material at the optimum conditions. Differences in hardness near the welded zone was dependant on the relative contents of ferrite.

Effect of Welding Speed on Mechanical Properties of Friction Stir Welded AA 6082-T6 Al Alloy

2018 ◽  
Vol 877 ◽  
pp. 98-103
Author(s):  
Dhananjayulu Avula ◽  
D.K. Dwivedi
Keyword(s):  
Tensile Strength ◽  
Welding Speed ◽  
Welded Joint ◽  
Al Alloy ◽  
Microstructural Properties ◽  
Nugget Zone ◽  
Percentage Elongation ◽  
Friction Stir ◽  
Mechanical And Microstructural Properties ◽  
Hardness Values

In this study the effect of process parameters on mechanical and microstructural properties of similar AA6082-T6 joints produced by friction stir welding was investigated. Different samples were produced by varying the transverse welding speeds of the tool from 19 to 75 mm/min and a fixed rotational speed of 635 rpm. A more uniform hardness values in the nugget zone were observed at 48 mm/min welding speed. The lowest hardness values were recorded on nugget zone at all the welding speeds. The increase in welding speed increases ultimate tensile strength and reaches maximum and further increase in welding speed results decrease in tensile strength were observed. The welded joint has highest joint efficiency (52.33 %) obtained at the welding speed of 48 mm/min. Similarly with the increase in welding speed decrease in the percentage elongation were recorded.

scholarly journals Modeling and Optimization of Bobbin Friction Stir Welding for AA6061-T6 alloy Utilizing Response Surface Methodology

2018 ◽  
Vol 26 (4) ◽  
pp. 1-17
Author(s):  
Samir Ali Amin ◽  
Mohannad Yousif Hanna ◽  
Alhamza Farooq Mohamed
Keyword(s):  
Tensile Strength ◽  
Response Surface Methodology ◽  
Friction Stir Welding ◽  
Welding Speed ◽  
Rotational Speed ◽  
Welded Joint ◽  
Welding Parameters ◽  
Friction Stir ◽  
Bending Force ◽  
Speed Range

Bobbin friction stir welding (BFSW) is special kind of friction stir welding. This investigation aims to develop empirical models through mathematical relationships between the welding process parameters and mechanical properties of Aluminum alloy AA6061-T6 welded joint created by using bobbin tool and to find the optimum welding parameters. The welding speed range (40-200 mm/min) and rotational speed range (340-930 rpm) were utilized (as the used input factors) to find their effects on elongation, tensile strength and maximum bending force as the main responses.  These models were built using Design of Experiment (DOE) software ‘version 10’ with Response Surface Methodology (RSM) technique. The models adequacy were tested via the (ANOVA) analysis. The obtained models appeared that as the welding speed or rotational speed increases, the elongation, tensile strength and maximum bending force of the welded joint firstly rise to a maximum value and then drop. The optimum welding parameters were rotational speed (623.949 rpm) and welding speed (128.795 mm/min) with (6.33%), (204 MPa) and (6.216 KN) of elongation, tensile strength and maximum bending force, respectively. A proper harmonization was obtained between the models predicted results and the optimized ones with actual trial with 95% level of confidence.

Effect of Welding Speed on CO2 Laser Beam Welded Aluminum-Magnesium Alloy 5083 in H321 Condition

2013 ◽  
Vol 685 ◽  
pp. 259-263 ◽  
Author(s):  
K. Subbaiah ◽  
Geetha Manivasagam ◽  
B. Shanmugarajan ◽  
S.R. Koteswara Rao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Laser Beam ◽  
Welding Speed ◽  
Welded Joint ◽  
Laser Beam Welding ◽  
Tensile Tests ◽  
Micro Hardness ◽  
Microstructural Characteristics ◽  
Hardness Tests

Laser beam welding of aluminum alloys is expected to offer good mechanical properties of welded joints. In this experimental work reported, CO2 laser beam welding at 3.5 kW incident power was conducted autogenously on 5 mm thick 5083-H321 aluminum alloy plates at different welding speeds. The mechanical properties and microstructural characteristics of the welds are evaluated through tensile tests, micro-hardness tests, optical microscopy and scanning electron microscopy (SEM). Both yield stress and tensile strength of the laser beam welded joint at the optimum welding speed were 88 % of base metal values. Experimental results indicate that the tensile strength and hardness of laser beam welds are affected by the variation of the intermetallic compounds.

scholarly journals Effects of ColdArc welding parameters on the tensile strengths of high strength steel plate investigated using the Taguchi approach

2019 ◽  
Vol 13 (2) ◽  
pp. 4846-4856
Author(s):  
S. D. Sabdin ◽  
N. I. S. Hussein ◽  
M. K. Sued ◽  
M. S. Ayob ◽  
M. A. S. A. Rahim ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Welding Speed ◽  
Heat Input ◽  
Steel Plate ◽  
Welding Current ◽  
Welding Parameters ◽  
Rolled Steel ◽  
Cold Rolled Steel ◽  
Taguchi Design Of Experiments ◽  
Cold Rolled

The objective of this study is to investigate the effect of process parameters on ColdArc welding of cold rolled steel plate using 1.2 mm diameter mild steel welding wire. A Taguchi Design of Experiments (DOE) method with grey relational analysis approach was selected for data collection and optimization. 9 experiments were conducted following the L9 (33) Taguchi Orthogonal Array Design. The best result   from the experiments for tensile strength was obtained for welding parameters of 70 A (current), 17.6 V (voltage) and 800 mm/min welding speed. Based on the results, the Taguchi analysis predicted the optimised tensile strength would be obtained when the welding current, welding voltage and speed are at 70V, 17.6A and 0.6 m/min, respectively. Thus, most significant parameters for tensile properties of cold rolled steel is welding speed (37%), voltage (34 %) and current (28%). These factors are critical in determining the tensile strength, where increasing the welding speed reduces the heat input. However, decreasing the heat input by lowering the welding voltage resulted in bad weld bead formation.

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