Optimized Mechanical Performance of Welded and Molded Butt Joints: Part II - Weld and Knit Lines Integrity

2003 ◽  
Vol 22 (10) ◽  
pp. 867-879 ◽  
Author(s):  
Val Kagan
Keyword(s):  
Mechanical Performance ◽  
Butt Joints

Microstructure and mechanical performance of autogenously fibre laser beam welded Ti-6242 butt joints

2017 ◽  
Vol 694 ◽  
pp. 110-120 ◽  
Author(s):  
Nikolai Kashaev ◽  
Dmitry Pugachev ◽  
Volker Ventzke ◽  
Fedor Fomin ◽  
Irmela Burkhardt ◽  
...  
Keyword(s):  
Laser Beam ◽  
Mechanical Performance ◽  
Fibre Laser ◽  
Butt Joints

scholarly journals The Microstructure and Mechanical Properties of Dual-Spot Laser Welded-Brazed Ti/Al Butt Joints with Different Groove Shapes

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5105
Author(s):  
Peng Li ◽  
Zhenglong Lei ◽  
Xinrui Zhang ◽  
Enze Cai ◽  
Yanbin Chen
Keyword(s):  
Temperature Field ◽  
Mechanical Performance ◽  
Al Alloys ◽  
Welding Wire ◽  
Butt Joints ◽  
Ductile Fractures ◽  
Weld Appearance ◽  
Brittle Fractures ◽  
Interfacial Intermetallic Compound ◽  
Beam Mode

Laser welding-brazing was performed to join Ti and Al together. The dual-spot laser beam mode was selected as the heat source in this study. Ti-6Al-4V and 6061-T6 Al alloys were selected as the experimental materials. Al-12Si welding wire was selected as the filler material. The effect of groove shape on the weld appearance, microstructure, temperature field, and mechanical performance of Ti/Al welded-brazed butt joints was investigated. The interfacial intermetallic compound (IMC) layer at the Ti/Weld brazing interface was inhomogeneous in joints with I-shaped and Y-shaped grooves. In Ti/Al joints with V-shaped grooves, the homogeneity of temperature field and IMC layer was improved, and the maximum thickness difference of IMC layer was only 0.20 μm. Nano-sized granular Ti7Al5Si12, Ti5Si3, and Ti(Al,Si)3 constituted the IMCs. The tensile strength of Ti/Al joints with V-shaped grooves was the highest at 187 MPa. The fracture mode transformed from brittle fractures located in the IMC layer to ductile fractures located in the Al base metal, which could be attributed to the improvement of the IMC layer at the brazing interface.

scholarly journals Disk Laser Welding of Car Body Zinc Coated Steel Sheets / Spawanie Laserem Dyskowym Blach Ze Stali Karoseryjnej Ocynkowanej

2015 ◽  
Vol 60 (4) ◽  
pp. 2913-2922 ◽  
Author(s):  
A. Lisiecki ◽  
R. Burdzik ◽  
G. Siwiec ◽  
Ł. Konieczny ◽  
J. Warczek ◽  
...  
Keyword(s):  
Laser Welding ◽  
Mechanical Performance ◽  
Galvanized Steel ◽  
Coated Steel ◽  
Butt Joints ◽  
Beam Spot ◽  
Disk Laser ◽  
Car Body ◽  
Steel Sheets ◽  
Zinc Coated Steel

Autogenous laser welding of 0.8 mm thick butt joints of car body electro-galvanized steel sheet DC04 was investigated. The Yb:YAG disk laser TruDisk 3302 with the beam spot diameter of 200 μm was used. The effect of laser welding parameters and technological conditions on weld shape, penetration depth, process stability, microstructure and mechanical performance was determined. It was found that the laser beam spot focused on the top surface of a butt joint tends to pass through the gap, especially in the low range of heat input and high welding speed. All test welds were welded at a keyhole mode, and the weld metal was free of porosity. Thus, the keyhole laser welding of zinc coated steel sheets in butt configuration provides excellent conditions to escape for zinc vapours, with no risk of porosity. Microstructure, microhardness and mechanical performance of the butt joints depend on laser welding conditions thus cooling rate and cooling times. The shortest cooling time t8/5 was calculated for 0.29 s.

Microstructure and Mechanical Properties of Welded Joints of Cr18Ni30Mo2Al3Nb Alloy

2014 ◽  
Vol 636 ◽  
pp. 89-92
Author(s):  
Rui Luo ◽  
Xiao Nong Cheng ◽  
Gui Fang Xu ◽  
Dong Sheng Li ◽  
Shun Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Arc Welding ◽  
Comparative Research ◽  
Mechanical Performance ◽  
Tensile Fracture ◽  
Welding Parameters ◽  
Butt Joints ◽  
Argon Flow ◽  
Scaning Electron Microscopy

In this present study, A comparative research on the mechanical properties of the dissimilar welded joints of 800H and Cr18Ni30Mo2Al3Nb was investigated. Butt joints were made using argon tungsten-arc welding (TIG). The TIG joint was made using well established welding parameters (i.e., current ampere of 110~120A, welding rate of 105~115mm/min, argon flow 8~10L/min and voltage of 12V). Mechanical behavior of joints was evaluated by room temperature and high temperature (650°C) tensile testing, and hardness testing, respectively. The microstructure of joint was characterized via optical microscopy, and the morphology of tensile fracture was observed by scaning electron microscopy. As can be seen from the experimental results, clearly shown that Cr18Ni30Mo2Al3Nb has better mechanical performance of welded joint than 800H.

scholarly journals Laser Welding of New Grade of Advanced High Strength Steel STRENX 1100 MC

2017 ◽  
Vol 62 (3) ◽  
pp. 1651-1657 ◽  
Author(s):  
A. Kurc-Lisiecka ◽  
J. Piwnik ◽  
A. Lisiecki
Keyword(s):  
Laser Welding ◽  
Base Metal ◽  
Mechanical Performance ◽  
High Strength ◽  
Carbon Equivalent ◽  
Welding Parameters ◽  
Low Carbon ◽  
Butt Joints ◽  
Significant Drop ◽  
Metal Impact

AbstractThe article presents results of investigations on autogenous laser welding of new grade STRENX 1100 MC steel. The modern Disk laser was applied for of 5.0 mm thick butt joints welding. The influence of laser welding parameters, mainly the energy input of laser welding on the penetration shape, weld quality, structure and mechanical performance was investigated. It was found that the investigated steel has surprisingly low carbon equivalent CET just 0.328, and also relatively high temperature of martensitic transformation Msat 430.6°C. Despite very rapid cooling times t8/5in a range from 0.6 to 1.3 s, thus rapid solidification there was no tendency to cracking of weld metal or HAZ. Significant drop of microhardness in the HAZ resulted in a decrease of tensile strength of joints, compared to the base metal. Impact toughness of test joints was at only 50÷60% of the base metal.

scholarly journals Study on the Mechanical Performance of Dissimilar Butt Joints between Low Ni Medium-Mn and Ni-Cr Austenitic Stainless Steels Processed by Gas Tungsten Arc Welding

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1439
Author(s):  
I. Reda Ibrahim ◽  
Mahmoud Khedr ◽  
Tamer S. Mahmoud ◽  
Hamed A. Abdel-Aleem ◽  
Atef Hamada
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Arc Welding ◽  
Mechanical Performance ◽  
Gas Tungsten Arc Welding ◽  
Uniaxial Tensile ◽  
Butt Joints ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

In the present work, dissimilar butt joints between a low-Ni, medium-Mn austenitic stainless steel, M-Mn SS, and a Ni-Cr austenitic stainless steel, Ni-Cr SS, were processed by utilizing the gas tungsten arc welding (GTAW) technique at different heat inputs. A filler metal of ER308 was employed in the welding process. The filler yields 480 MPa, which is equivalent to the yield strength of M-Mn SS. The microstructural analysis and mechanical performance (i.e., tensile strength and hardness properties) of the concerned joints were studied by using an optical microscope and uniaxial tensile tests, respectively. The results revealed that a duplex structure from austenite matrix and delta ferrite is promoted in the fusion zone (FZ) of the dissimilar joints processed with low and high energy inputs (0.486 kJ/mm and 0.558 kJ/mm). The FZ of the specimens welded at high heat input exhibited the lowest hardness value (151.2 HV) in comparison to heat affected zone (HAZ) (166.3 HV). Moreover, the joints exhibited a low tensile strength of 610 MPa. The achieved strength is significantly lower than the strengths of the base metals (BMs) M-Mn SS and Ni-Cr SS. This is mainly attributed to the inhomogeneous dendritic structure of the FZ with Cr-carbides precipitation.

scholarly journals Fracture Resistance of Flash Welded and Laser Welded Butt Joints in a Microalloyed HSLA Steel

2017 ◽  
Vol 754 ◽  
pp. 248-251
Author(s):  
C.A.R.P. Baptista ◽  
H.V. Ribeiro ◽  
M.S.F. Lima ◽  
Marcelo A.S. Torres ◽  
D.H.S. Costa
Keyword(s):  
Heat Input ◽  
Structural Reliability ◽  
Mechanical Performance ◽  
Welded Joint ◽  
Hsla Steel ◽  
Production Capacity ◽  
Welding Process ◽  
High Strength ◽  
Butt Joints ◽  
Welding Processes

High-strength, low-alloy (HSLA) steels are widely used in the automotive and oil industries due to their good mechanical properties and weldability. The selection of the welding process depends on several factors, including the quality of the weld bead and the production capacity. The knowledge of the mechanical performance of the welded joint is essential to ensure structural reliability. In the present work, butt joints were produced from 5 mm thick plates of a microalloyed HSLA steel by flash welding and by laser welding processes, the latter using two different heat input conditions. The microsctructure and hardness of the weld beads were evaluated. The fracture toughness of the welded joints was assessed by means of CTOD tests. The higher heat input laser welded joint presented critical CTOD comparable to that of the flash welded joint, whereas the lower heat input martensitic-bainitic laser welded joint tended to a brittle behavior.

scholarly journals Welding of Thermomechanically Rolled Fine-Grain Steel by Different Types of Lasers/ Spawanie Stali Drobnoziarnistej Walcowanej Termomechanicznie Laserami Różnego Typu

2014 ◽  
Vol 59 (4) ◽  
pp. 1625-1631 ◽  
Author(s):  
A. Lisiecki
Keyword(s):  
Laser Welding ◽  
Diode Laser ◽  
Mechanical Performance ◽  
Welding Parameters ◽  
Butt Joints ◽  
Disk Laser ◽  
Fine Grain ◽  
Wide Range ◽  
Weld Porosity ◽  
Diode Laser Welding

Abstract The autogenous laser welding of 2.5 mm thick butt joints of thermomechanically rolled fine-grain steel grade S420MC was investigated. Butt joints were laser welded by the Yb:YAG Disk laser, emitted a circular laser beam with spot diameter of 200 μm at 1.03 μm wavelength, and also by the high power direct diode laser, emitted a rectangular beam with dimension of 1.8x6.8 mm at 808 nm wavelength. Different welding modes were identified for the lasers applied. The conduction welding mode was observed in whole of the diode laser welding parameters. While high quality joints, without any internal defects and characterized with satisfactory mechanical performance were produced in a wide range of parameters. The butt joints produced by Disk laser were welded at keyhole mode. In this case a slight tendency to weld porosity was found.

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