Authors: Chi, C.-T.; Chao, C.-G.; Liu, T.-F.; Wang, C.-C.

Source: Science and Technology of Welding & Joining, Volume 13, Number 2, February 2008 , pp. 199-211(13)

Publisher: Maney Publishing

Abstract:

The dependence of ultimate tensile strength (UTS) on the parameters of low voltage and high voltage electron beam welding (LV- and HVEBW) has been analyed by changing one factor at a time (COFAAT) and by Taguchi's method for AZ series magnesium alloys. COFAAT is a conventional method for trend analysis of each parameter. However, its cost is high and a long time is needed, and interactions between parameters are ignored. On the other hand, Taguchi's method cannot only reduce the number of experiments, but also provide precise optimum parameters and predicted UTS even when a few data points are lost. According to the results of analysis of variance, the strength of a weldment is affected by oscillation of the beam, the focal position, the welding speed, the accelerating voltage, the beam current and stress relief, in order of impact. The general trend is for the optimum parameters to include a non-oscillating beam, focus at the bottom and no stress relief. With regard to welding speed, accelerating voltage and beam current, there are no specific trends. Finally, the differences in welds between LV- and HVEBW for AZ series forged alloys have been examined to study the mechanism of pore formation, which results from the dissolution of precipitates to reform molecular oxygen. It is also emphasised that the area and shape of the weld cross-section are related to the input power and welding speed.

Keywords: TAGUCHI'S METHOD; ELECTRON BEAM WELDING; WELD SHAPE; MECHANISM OF PORE FORMATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174329307X227274

Publication date: 2008-02-01

More about this publication?

• Now online only
  
  Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.

  This journal features top 10 articles which are freely available. Please click here and click on the 'Top articles' link in the right-hand menu to view the list and start downloading.

• Editorial Board
• Information for Authors
• Subscribe to this Title
• Terms & Conditions
• Online submission site
• Top 10 Articles
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: Materials & Manufacturing ,  Mining & Metallurgy
• By this author: Chi, C.-T. ;  Chao, C.-G. ;  Liu, T.-F. ;  Wang, C.-C.

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers