Metallurgy and Mechanics of Welding

Assessment and statistical correlation of mechanical properties of double sided single pass submerged arc welded line pipe steel

Boron steel, classed as an ultra high-strength steel (UHSS), has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. UHSS spot welds exhibit unique hardness distributions, with a hard nugget and outlying base material, but with a soft heat-affected zone in-between these regions. This soft zone reduces the strength of the weld and makes it susceptible to failure. Due to the interaction of various weld zones that occurs during loading, there is a need to characterize the loading response of the weld for accurate failure predictions. The loading response of certain weld zones, as well as failure loci, was obtained through physical simulation of the welding process. The results showed a significant difference in mechanical behavior through the weld length. An important result is that instrumented indentation was shown to be a valid, quantitative method for verifying the accuracy with which weld microstructure has been recreated with regard to the target weld microstructure.

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Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

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The safety analysis concept of welded components under cyclic loads using fracture mechanics method

Problems of industries and manufacturers of welded structures in aluminium alloys are centred on reduction of mechanical properties in welded joints due to heat input effects on the heat affected zone; as well as effects of discontinuities and metallurgical defects, high cost repairs, and low productivity. The aim of this paper is to evaluate the influence of gas mixtures 80Ar20He (MG1), 60Ar40He (MG2), 80Ar19He1O2 (MG3), and 60Ar39He1O2 (MG4), on aluminium alloy AA5083-O weldability using filler metal ER5183 using the automated GMAW-P process. Methodology has included a factorial experiment design, customisation of welding parameters, and characterisation of base metal and welding regions. Analysis of results were carried out based on microstructure evaluation of welding regions, measurements of hardness and tensile properties, observations of discontinuities and defects, costs evaluation, and welding speed. Results show that gas mixtures with O2 are highly beneficial to obtain good weldability o...

Influence of gas mixtures Ar-He and Ar-He-O2 on weldability of aluminum alloy AA5083-O using automated GMAW-P

Lappeenranta University of Technology Faculty of Technology Mechanical Engineering

Metallurgy and Mechanics of Welding

Citations

Assessment and statistical correlation of mechanical properties of double sided single pass submerged arc welded line pipe steel

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

The safety analysis concept of welded components under cyclic loads using fracture mechanics method

Influence of gas mixtures Ar-He and Ar-He-O2 on weldability of aluminum alloy AA5083-O using automated GMAW-P

Optimization of parameters for fiber laser-MAG hybrid welding in shipbuilding applications

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