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Date of Publication:2017-01-01

Journal:激光与光电子学进展

Volume:54

Issue:3

Page Number:031404

ISSN No.:1006-4125

Abstract:The process of laser welding with filler wire(LWFW)is presented to solve
   the problem of negative reinforcement of thin sheet weld seam,and to
   satisfy the requirement of high precision assembly in laser self-fusing
   welding.LWFW experiment about Hastelloy C-276shielding materials is
   carried out,and the effects of process parameters on the weld forming
   are studied.The microstructures,element distribution and micro-hardness
   of weld joints in different zones are analyzed.The results indicate that
   the weld joints with controllable positive reinforcements on both top
   and bottom surfaces by using LWFW can be obtained,and the weld
   appearance with uniform reinforcements and contact angles on upper and
   lower surface is available under the optimized process parameters
   conditions.Obvious grain refinement in weld joint and no obvious
   heat-affected zone at the junction of base metal and fusion line are
   observed.The element distribution of weld is uniform in different
   melting zones,and macro segregation is not found,but micro segregation
   of Mo in columnar dendrite zone is significant.The microhardness of weld
   joint is well-distributed in different regions and the value is
   basically equivalent to that of base metal.

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