scholarly journals Studying the effect of laser welding parameters on the quality of ZEK100 magnesium alloy sheets in lap joint configuration

2012 ◽  
Author(s):  
Masoud Harooni ◽  
Fanrong Kong ◽  
Blair Carlson ◽  
Radovan Kovacevic
Keyword(s):  
Magnesium Alloy ◽  
Laser Welding ◽  
Welding Parameters ◽  
Lap Joint ◽  
Joint Configuration

Dissimilar Materials Laser Welding between Stainless Steel 304 and Thermoplastics

2016 ◽  
Vol 719 ◽  
pp. 142-148 ◽  
Author(s):  
Rattana Borrisutthekul ◽  
Anchalee Saengsai ◽  
Pusit Mitsomwang
Keyword(s):  
Stainless Steel ◽  
Welding Speed ◽  
Dissimilar Materials ◽  
Decomposition Temperature ◽  
Lap Joint ◽  
Joint Configuration ◽  
Focal Position ◽  
Stainless Steel 304

Nowadays, dissimilar materials welding, especially between metal to plastics, has been become the hottest issue. The objective of the study is to investigate the effects of physical properties of plastics on the weldability and the quality of the dissimilar materials welding between SUS304 stainless steel and plastics. In experiment, the lap joint configuration with SUS304 put on the top was applied. The welding speed, focal position, and keeping period of weld after welding were varied. The results indicated that the decomposition temperature of plastics affected both weldability and quality of joint after welding. Moreover, crazing was a prominent property to be considered for long-term use of the dissimilar materials welding as the specimen could fracture by itself after a period of time without any application of the external load.

scholarly journals Dissimilar Metals Laser Welding between DP1000 Steel and Aluminum Alloy 1050

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 102 ◽  
Author(s):  
António Pereira ◽  
Ana Cabrinha ◽  
Fábio Rocha ◽  
Pedro Marques ◽  
Fábio Fernandes ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Welding ◽  
Mechanical Tests ◽  
Welding Parameters ◽  
Dissimilar Metals ◽  
Butt Welding ◽  
Electron Microscopes ◽  
1050 Aluminum Alloy ◽  
Scanning Electron Microscopes

The welding of dissimilar metals was carried out using a pulsed Nd: YAG laser to join DP1000 steel and an aluminum alloy 1050 H111. Two sheets of each metal, with 30 × 14 × 1 mm3, were lap welded, since butt welding proved to be nearly impossible due to the huge thermal conductivity differences and melting temperature differences of these materials. The aim of this research was to find the optimal laser welding parameters based on the mechanical and microstructure investigations. Thus, the welded samples were then subjected to tensile testing to evaluate the quality of the joining operation. The best set of welding parameters was replicated, and the welding joint obtained using these proper parameters was carefully analyzed using optical and scanning electron microscopes. Despite the predicted difficulties of welding two distinct metals, good quality welded joints were achieved. Additionally, some samples performed satisfactorily well in the mechanical tests, reaching tensile strengths close to the original 1050 aluminum alloy.

scholarly journals Mitigation of Pore Generation in Laser Welding of Magnesium Alloy AZ31B in Lap Joint Configuration

2012 ◽  
Author(s):  
Masoud Harooni ◽  
Fanrong Kong ◽  
Blair Carlson ◽  
Radovan Kovacevic
Keyword(s):  
Magnesium Alloy ◽  
Oxide Layer ◽  
Hydrogen Gas ◽  
Chemical Compositions ◽  
Plasma Arc ◽  
Lap Joint ◽  
Joint Configuration ◽  
Mechanical Removal ◽  
Magnesium Alloy Az31b ◽  
Bead Profile

Magnesium, as the lightest structural metal, has been widely used in the automotive and aerospace industries. Porosity is the main issue in the welding of magnesium alloys and can be caused by surface coatings, hydrogen gas, pre-existing porosity, the collapse of an unstable keyhole and vaporization of alloying elements. In this study, the effect of the oxide layer on pore generation in the welding of AZ31B-H24 magnesium alloy is investigated. A fiber laser with a power of up to 4 kW is used to weld samples in a lap joint configuration. Two groups of samples are studied: as received (AR) surfaces (where an oxide layer remains on the surface) and treated surfaces. The surface treatment includes two techniques: mechanical removal (MR) and the use of a plasma arc (PA) as a preheating source. Also, a separate set of experiments are designed for preheating samples in a furnace in order to investigate whether the pore mitigation effect of a plasma arc is caused by preheating. Observations include a weld bead profile achieved through optical microscopy, chemical compositions tested by Electron Dispersive Spectroscopy (EDS), and mechanical properties measured with a tensile test. The results obtained show that the preheating effect of a plasma arc procedure can effectively mitigate pore generation. The tensile-shear results reveal that PA samples have a higher strength than other groups of samples.

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