By C.T. Dawes (Auth.)
Permits the reader either to appreciate and to exploit, in a pragmatic demeanour, laser welding. the writer explains the foundations of laser welding and gives examples of commercial purposes, examines many points of laser welding and devotes a whole bankruptcy to defense
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Extra info for Laser Welding. A Practical Guide
Example text
See text. Welds and their HAZs are hard and brittle due to the high carbon content, see text. Good quality welds with fine grain structurescan be achieved. but material cleaning just prior to welding and high quality weld pool gas shielding are essential. e. strength, toughness, wear resistance, formability, machinability. etc. To meet the service and manufacturing requirements the chosen material will contain numerous alloying elements, some of which can affect weld quality. Because a material can be welded (by whatever process) it does not necessarily mean that the welds are always mechanically and metallurgically sound.
The material manufacturer should heconsulted with respect to weld properties. in case a filler material is required to improve them. Coppcr C ~ Siron I Nickel base and high nickel alloys ( ( 2 6 3 . thstelloy. Inconel. Incoloy. Kovar. Monel. Ninionic. PK33. v Low carbon and high strength low alloy (HSLA) forming grades Medium and high carbon Very good quality welds can be achieved provided sulphur and phosphorus levels are kept low. sce text. Weldable. but special precautions are necessary to ensure ecccptable weld properties.
Material allowances for post-weld machining are often unnecessary and weld land sizes can be reduced. promoting material savings. Design considerations concerning magnetic fields and short circuit paths are eliminated. 1 cont'd DISADVANTAGES I Close fitting and well clamped joints are required The small focused spot size of a laser beam will pass through narrow gaps. especially between thin sheets. Poorly fitting parts produce undercut welds. unless filler wire is used. 2 Accurate beam/joint alignment is necessary The narrow weld can easily miss the joint line if not accurately positioned.