LASER-MIG Hybrid Welding of Thick Plates of Mild Steel in Single Pass

2012 ◽  
Vol 45 (2) ◽  
pp. 29 ◽  
Author(s):  
G. Padmanabham ◽  
B. Shanmugarajan ◽  
K. V. Phani Prabhakar
2012 ◽  
Vol 45 (2) ◽  
pp. 29
Author(s):  
G. Padmanabham ◽  
B. Shanmugarajan ◽  
K. V. Phani Prabhakar

Author(s):  
Ivan Bunaziv ◽  
Cato Dørum ◽  
Steen Erik Nielsen ◽  
Pasi Suikkanen ◽  
Xiaobo Ren ◽  
...  

AbstractSingle-pass laser beam welding (LBW) of steel components with wall thickness of > 10 mm is of high interest due to enhanced productivity. Deep penetration LBW provides excessive hardness and certain quality issues such as root humping in flat position, which is associated with disability of surface tension to sustain melt dropout. High hardness is associated with fast cooling rates and shortage of filler wire transportation to the root of the fusion zone. Use of laser-arc hybrid welding (LAHW) can promote acicular ferrite by adding filler metal and additional heat input from the arc. However, LAHW may promote humping and adjustment of many parameters is required hindering its application. In this work, a 16 kW disk laser was used in butt welding of 12 mm and 15 mm thick plates with different bevelling geometries. Root humping occurred within a wide range of process parameters providing narrow process window. Twelve millimeter thick plates were successfully welded with a single-pass technique providing good quality of root by using zero air gap regardless bevelling geometry. Welding of 15 mm plates was more challenging, and the process was sensitive even with a slight parameter change. Improved results were achieved with application of small air gap. Acceptable hardness in both weld metal and heat affected zone (< 290 HV) was achieved for both plate thicknesses providing good toughness of minimum 27 J at −50°C.


2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Norman Jones ◽  
R. S. Birch ◽  
R. Duan

This article studies the perforation of mild steel square and rectangular plates struck normally by cylindrical projectiles having blunt, hemispherical, and conical impact faces. Experimental results are obtained in a drop hammer rig for the perforation of 4mm and 8mm thick plates struck by relatively heavy projectiles weighing between 11.9kg and 200kg and traveling at an initial velocity up to about 13m∕s. The plates were struck at the center and at several positions near the fully clamped supports. The effect of the aspect ratio on the perforation energies of rectangular plates is examined, and comparisons are made with the perforation behavior of fully clamped circular plates. The predictions of several empirical equations are compared with the corresponding experimental values of the perforation energies. Simple design equations are also presented for predicting the maximum permanent transverse displacements of square plates prior to any cracking or perforation.


2017 ◽  
Vol 126 ◽  
pp. 867-883
Author(s):  
Jian-Nan Yang ◽  
Lin-Jie Zhang ◽  
Jie Ning ◽  
Qing-Lin Bai ◽  
Xian-Qing Yin ◽  
...  

Author(s):  
M Abilash ◽  
D Senthil kumar ◽  
G Padmanabham ◽  
Paniprabhakar ◽  
R Padmanaban ◽  
...  

2016 ◽  
Vol 31 (16) ◽  
pp. 2186-2198 ◽  
Author(s):  
L. Subashini ◽  
K. V. Phani Prabhakar ◽  
Ravi C. Gundakaram ◽  
Swati Ghosh ◽  
G. Padmanabham

2019 ◽  
Vol 271 ◽  
pp. 413-419 ◽  
Author(s):  
K. Devendranath Ramkumar ◽  
Koya Dharmik ◽  
Brantin Noronha ◽  
K. Giri Mugundan ◽  
Sai Bhargav ◽  
...  

2011 ◽  
Vol 55 (1-2) ◽  
pp. 39-49 ◽  
Author(s):  
Elin Marianne Westin ◽  
Karen Stelling ◽  
Andrey Gumenyuk

2018 ◽  
Vol 3 (1) ◽  
pp. 12-18
Author(s):  
Prihatno Kusdiyarto ◽  
Riswan Dwi Djatmiko

The aim of this study is to determine the effects of included angle dimension on the distortion of carbon steel V-groove butt joint using a single pass welding methods. Specimens being studied were AISI 1025 low carbon steel in the form of 1/2 inch-thick plates. The steels were easily weld and were assumed as homogeneous and isotropic; therefore, three specimens for each treatment are adequate. The experiment treated the v-groove shape as independent variable and the distortion as dependent variable. The results show that there is an effect of v-groove dimensions on the distortion of the carbon steels butt joint.. The distortion and their respective angle dimensions are 0.58˚ for the 55˚ angle, 0.78˚ for the 60˚ angle, and 1.02˚ for the 65˚ angle. The magnitude of the distortions are well below 3˚, which is the permissible amount for the butt joint distortion criteria.Tujuan penelitian ini untuk mengetahui ada tidaknya pengaruh dimensi included angle (bentuk kampuh) terhadap distorsi pada sambungan ujung baja karbon dengan metode pengelasan SMAW single pass. Dalam penelitian ini obyek yang diteliti adalah baja karbon rendah type AISI 1025 yang berupa plat strip dengan ketebalan 1/2 inchi. Baja jenis ini merupakan bahan yang mudah dilas dan diasumsikan homogen dan isotropic, sehingga sampel yang diambil cukup tiga buah pada masing-masing perlakuan. Bentuk included angle merupakan variabel bebas dan distorsi adalah variabel terikat. Hasil penelitian menunjukkan adanya pengaruh dimensi included angle terhadap distorsi pada sambungan ujung baja karbon. Besarnya distorsi pada sambungan dengan dimensi sudut 55˚ sebesar 0,58˚, 60˚ sebesar 0,78˚, 65˚ sebesar 1,02˚. Hal ini memberikan informasi bahwa variasi sudut included angle tersebut menghasilkan distorsi di bawah 3˚, sehingga masih termasuk dalam batas yang diijinkan persyaratan kelolosan sambungan las.


2014 ◽  
Vol 61 ◽  
pp. 239-250 ◽  
Author(s):  
Geng Li ◽  
Chen Zhang ◽  
Ming Gao ◽  
Xiaoyan Zeng
Keyword(s):  

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