Mitigation of porosity defects in fiber laser welding under low vacuum

2020 ◽  
Vol 276 ◽  
pp. 116385 ◽  
Author(s):  
Meng Jiang ◽  
Xi Chen ◽  
Yanbin Chen ◽  
Wang Tao
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Fiber Laser Welding ◽  
Porosity Defects

scholarly journals Effect of Heat Input on Porosity Defects in a Fiber Laser Welded Socket-Joint Made of Powder Metallurgy Molybdenum Alloy

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1433 ◽  
Author(s):  
Miao-Xia Xie ◽  
Yan-Xin Li ◽  
Xiang-Tao Shang ◽  
Xue-Wu Wang ◽  
Jun-Yu Pei
Keyword(s):  
Computed Tomography ◽  
Powder Metallurgy ◽  
Laser Welding ◽  
Fiber Laser ◽  
Heat Input ◽  
Dominant Role ◽  
Fusion Welding ◽  
Fiber Laser Welding ◽  
Welding Heat Input ◽  
Porosity Defects

Porosity defects are still a challenging issue in the fusion welding of molybdenum and its alloys due to the pre-existing interior defects associated with the powder metallurgy process. Fiber laser welding of end plug and cladding tube made of nanostructured high-strength molybdenum (NS-Mo) alloy was performed in this work with an emphasis on the role of welding heat input. The distribution and morphology of porosity defects in the welded joints were examined by computed tomography (CT) and scanning electron microscopy (SEM). Preliminary results showed that laser welding of NS-Mo under low heat input significantly reduced the porosity defects in the fusion zone. The results of computed tomography (CT) showed that when the welding heat input decreased from 3600 J/cm (i.e., 1200 W, 0.2 m/min) to 250 J/cm (i.e., 2500 W, 6 m/min), the porosity ratio of the NS-Mo joints declined from 10.7% to 2.1%. Notable porosity defects under high heat input were related to the instability of the keyhole, expansion and the merging of bubbles in the molten pool, among which the instability of the keyhole played the dominant role. The porous defects at low heat input were generated as bubbles released from the powder metallurgy base metal (BM) did not have enough time to overflow and escape.

Laser absorption in high-power fiber laser welding of stainless steel and aluminum alloy

2008 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Yousuke Kawahito ◽  
Masami Mizutani ◽  
Seiji Katayama
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Laser Welding ◽  
Laser Absorption

Dissimilar unbeveled butt joints of AA6061 to S235 structural steel by means of standard single beam fiber laser welding-brazing

2021 ◽  
Vol 291 ◽  
pp. 116994
Author(s):  
D. Wallerstein ◽  
F. Lusquiños ◽  
R. Comesaña ◽  
J. del Val ◽  
A. Riveiro ◽  
...  
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Structural Steel ◽  
Fiber Laser Welding ◽  
Butt Joints ◽  
Single Beam

Ytterbium fiber laser welding of Ti6Al4V alloy

2015 ◽  
Vol 20 ◽  
pp. 250-256 ◽  
Author(s):  
Giuseppe Casalino ◽  
Michelangelo Mortello ◽  
Sabina L. Campanelli
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Ti6al4v Alloy ◽  
Fiber Laser Welding

Fiber laser welding of NiTi to Ti-6Al-4V

2015 ◽  
Vol 81 (9-12) ◽  
pp. 1533-1538 ◽  
Author(s):  
R. M. Miranda ◽  
E. Assunção ◽  
R. J. C. Silva ◽  
J. P. Oliveira ◽  
L. Quintino
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Fiber Laser Welding

Fiber Laser Welding of Noncombustible Magnesium Alloy

2008 ◽  
Vol 580-582 ◽  
pp. 479-482 ◽  
Author(s):  
Yuji Sakai ◽  
Kazuhiro Nakata ◽  
Takuya Tsumura ◽  
Mitsuji Ueda ◽  
Tomoyuki Ueyama ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Magnesium Alloy ◽  
Laser Welding ◽  
Fiber Laser ◽  
Vickers Hardness ◽  
Laser Power ◽  
Welded Joint ◽  
Welding Process ◽  
Fiber Laser Welding ◽  
Laser Welding Process

Noncombustible magnesium alloy AMC602 (Mg-6mass%Al-2mass%Ca) extruded sheet of 2.0mm thickness was successfully welded using a fiber laser welding process at welding speed of 10m/min at 3kW laser power. Tensile strength of the welded joint was about 82 to 88% of that of the base metal. Vickers hardness, tensile strength and micro structural properties are also discussed.

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