scholarly journals Distribution of Al Element of Ti–6Al–4V Joints by Fiber Laser Welding

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 566 ◽  
Author(s):  
Jiajia Zhang ◽  
Renzhi Hu ◽  
Shengyong Pang ◽  
Anguo Huang
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Molten Pool ◽  
Fiber Laser Welding ◽  
Butt Welding ◽  
Solute Element ◽  
Self Diffusion ◽  
The Difference ◽  
Joint Quality

In the process of laser welding, the uneven distribution of solute elements caused by element burning loss and flow of molten pool affects the quality of joints. In this paper, butt welding experiments were conducted on the 3 mm thick Ti–6Al–4V specimens with different preset ratios of Al and Si powders by using 4 kW fiber laser. The distribution of Al solute element and its influence on the microstructure and mechanical properties of the final weld joint were investigated. The results showed that the self-diffusion of Al element and the flow of molten pool affects the alloy elements distribution in laser welding. And the microhardness of the welded joint with Ti–6Al–4V and 90% Al + 10% Si powders was significantly higher than that with only Ti–6Al–4V, with the difference of about 130HV. At the same time, in the joint with 90% Al and 10% Si powders, the acicular α’ size was finer, and basketweave microstructure was present as well. This research is helpful to better understand the distribution of Al solute element and its influence on the joint quality during laser welding of Ti–6Al–4V alloy, which provides a certain reference for improving the weld or surface properties of Ti–6Al–4V alloy during laser processing.

Contrasting Study on Quality of SUS301L-HT Jointsin Fiber Laser Welding and MIG Welding

2015 ◽  
Vol 42 (7) ◽  
pp. 0703003 ◽  
Author(s):  
唐舵 Tang Duo ◽  
王春明 Wang Chunming ◽  
田曼 Tian Man ◽  
王军 Wang Jun ◽  
胡席远 Hu Xiyuan
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Mig Welding ◽  
Fiber Laser Welding

scholarly journals A New Method to Assess Fiber Laser Welding Quality of Stainless Steel 304 Based on Machine Vision and Hidden Markov Models

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 130633-130646
Author(s):  
Xin Tang ◽  
Ping Zhong ◽  
Lingling Zhang ◽  
Jun Gu ◽  
Zhaopeng Liu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Fiber Laser ◽  
Hidden Markov Models ◽  
Markov Models ◽  
Hidden Markov ◽  
Welding Quality ◽  
Fiber Laser Welding ◽  
Stainless Steel 304

Detection of Seam Offset Based on Molten Pool Characteristics during High-Power Fiber Laser Welding

2012 ◽  
Vol 549 ◽  
pp. 1064-1068
Author(s):  
Jian Bin Liang ◽  
Xiang Dong Gao ◽  
De Yong You ◽  
Zhen Shi Li ◽  
Wei Ping Ruan
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Molten Pool ◽  
High Energy ◽  
High Energy Density ◽  
Deep Penetration ◽  
Characteristic Parameters ◽  
Fiber Laser Welding ◽  
Deep Penetration Welding

Laser welding includes the heat conduction welding and the deep penetration welding. Deep penetration welding can not only penetrate the material completely, but also can vaporize the material. An important phenomenon during deep penetration welding is that molten pool in the weldment will appear a keyhole. The formation of the keyhole leads to a deep penetration weld with a high aspect ratio and this is the most advantageous feature of welding by high-energy-density beams. Small focus wandering off weld seam may result in lack of penetration or unacceptable welds, and largely reduce heating efficiency. In a fiber laser butt-joint welding of Type 304 austenitic stainless steel plate with a high power 6kW continuous wave fiber laser, an infrared sensitive high-speed video camera was used to capture the dynamic images of the molten pools. The configurations of molten pools were analyzed through image processing techniques such as median filtering, partial Otsu threshold segmentation and Canny edge to obtain the edge of keyholes and molten pools. The circular degree and the area of keyholes and the width and average gray of molten pools were defined as characteristic parameters to reflect the seam offset between the laser beam and the weld center. By analyzing the change of characteristic parameters during welding process, it was found that these parameters were related to the seam offset. Welding experimental results and analysis of characteristic parameters confirmed that the seam offset could be monitored and distinguished by molten pools configuration during high-power fiber laser welding.

Extraction of Molten Pool and Keyhole Characteristics during High Power Fiber Laser Welding

2012 ◽  
Vol 532-533 ◽  
pp. 344-347
Author(s):  
Ren He Zhen ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Molten Pool ◽  
Critical Role ◽  
Welding Process ◽  
Fiber Laser Welding ◽  
Inspection Method ◽  
Weld Pool Geometry ◽  
Laser Welding Process

It is well known that weld pool geometry plays a critical role in laser welding. In this study, an IPG YLR-10000 device was used to capture a series of molten pool images during high power fiber laser welding process. Then an extraction method of the geometric characteristics of these images was developed. This method could be applied to monitor the configuration of a molten pool and keyhole which was related to welding quality. The experimental results showed that this method was a reliable inspection method for monitoring the configuration of molten pool during high power fiber laser welding.

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