The present paper is concerned with hybrid laser-arc welding processes. Previous work is reviewed, and attention is then focused on plasma augmented laser welding. Features, application parameters, and mechanisms of the process are discussed, followed by a summary of the research and development work undertaken by the present authors, concentrating on application areas where the process can offer distinct advantages, such as tailor welded blanks, lap welding of coated steels, welding using additional filler material, and high speed welding of thin sheet metals.

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