Porosity Formation in Laser Welding of Tailored Blanks Nippon Steel Corporation

Format:

Conference/Event

Author/Creator:

Miyazaki, Yasurtobu, author.

Conference Name:

International Body Engineering Conference & Exposition (2003-10-27 : Tokyo, Japan)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2003

Summary:

For the laser welded tailored blanks (TBs), the formability of TBs depends on pores in the weld bead. Those pores are easily formed by CO2 laser but hardly observed by YAG laser. Based on a quantitative analysis of nitrogen content in the weld metal, gases in pores and the laser induced plasma, it is considered that high temperature of the plasma encourages dissolving nitrogen into the molten metal from the root surface and the dissolved nitrogen forms porosity due to an abrupt decreasing of nitrogen solubility at solidification of the molten metal. Also, the plume temperature in YAG laser welding is lower than the plasma temperature in CO2 laser welding and the nitrogen dissolution must therefore be suppressed in YAG laser welding

Notes:

Vendor supplied data

Publisher Number:

2003-01-2852

Access Restriction:

Restricted for use by site license