Detection of defects in laser welding of AZ31B magnesium alloy in zero-gap lap joint configuration by a real-time spectroscopic analysis

2014 ◽  
Vol 56 ◽  
pp. 54-66 ◽  
Author(s):  
Masoud Harooni ◽  
Blair Carlson ◽  
Radovan Kovacevic
Keyword(s):  
Magnesium Alloy ◽  
Laser Welding ◽  
Real Time ◽  
Spectroscopic Analysis ◽  
Lap Joint ◽  
Joint Configuration ◽  
Az31b Magnesium Alloy ◽  
Detection Of Defects

Real-time monitoring of laser welding of galvanized high strength steel in lap joint configuration

2012 ◽  
Vol 44 (7) ◽  
pp. 2186-2196 ◽  
Author(s):  
Fanrong Kong ◽  
Junjie Ma ◽  
Blair Carlson ◽  
Radovan Kovacevic
Keyword(s):  
Laser Welding ◽  
Real Time ◽  
High Strength Steel ◽  
High Strength ◽  
Lap Joint ◽  
Real Time Monitoring ◽  
Joint Configuration

Analysis on welding characteristics of ultrasonic assisted laser welding of AZ31B magnesium alloy

2018 ◽  
Vol 105 ◽  
pp. 15-22 ◽  
Author(s):  
Zhenglong Lei ◽  
Jiang Bi ◽  
Peng Li ◽  
Tao Guo ◽  
Yaobang Zhao ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Laser Welding ◽  
Az31b Magnesium Alloy ◽  
Ultrasonic Assisted

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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