The invention discloses an additive
welding method for large-thickness frame
metal parts, which comprises the following steps: (1) groove
shape design and
welding preparation: preparing a single-facegroove which is a U-shaped groove or a V-shaped groove, sanding the to-be-welded part with the groove, cleaning the part with
acetone to remove surface impurities, taking out and blow-
drying the to-be-welded part, and clamping the to-be-welded part by a reversible deformation method, wherein the
welding flux is
alloy powder by ball milling, and the particle
diameter is 100 to 150 microns; (2)
laser additive welding experiment: a
powder head and a
powder supply box are connected in a selected welding device, the powder supply device is connected with a
numerical control machine tool on a welding
machine tool, according to a preset track, the powder head supplies the
alloy powder which is in a coaxial
coupling relationship with the
laser light output by a
laser, the fused surface of the to-be-welded part and the
alloy powder form a large multi-layered fused area, and the
weld pool Is cooled and solidified to form a stack layer, and the connection between two to-be-welded parts is realized.