Method of improving weld quality
First Claim
1. A method of laser welding aluminum or magnesium members, said method comprising:
- positioning said members together in contact between facing surfaces thereof to expose a first outer surface of at least one of said members to laser irradiation;
directing a welding laser beam at said members so as to form a molten weld pool to fuse said members together;
moving said welding laser beam relative to said members; and
heating a zone of said members so as to increase the temperature thereof and widen a heat-affected zone to slow the rate of solidification of said molten weld pool, thereby enabling formation of a substantially porosity-free weld bead joining said members.
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Accused Products
Abstract
A method of improving weld quality between aluminum members by slowing the rate of solidification of a molten weld trough into solidified material. Upper and lower aluminum members are positioned together in contact between facing surfaces thereof to expose a first outer surface of the upper aluminum member to laser irradiation. A welding laser beam is moved in a path over the first outer surface, wherein the welding laser beam has an energy and width to progressively melt a trough of molten metal to a depth through the upper aluminum member and into the lower aluminum member. The molten metal in the trough has a void filled with gas, and the molten metal re-solidifies into re-solidified metal after the passage of the welding laser beam. An area in and around the trough is heated to slow the rate of solidification of the molten metal into the re-solidified metal, thereby preventing entrainment of the gas within the re-solidified metal.
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Citations
17 Claims
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1. A method of laser welding aluminum or magnesium members, said method comprising:
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positioning said members together in contact between facing surfaces thereof to expose a first outer surface of at least one of said members to laser irradiation;
directing a welding laser beam at said members so as to form a molten weld pool to fuse said members together;
moving said welding laser beam relative to said members; and
heating a zone of said members so as to increase the temperature thereof and widen a heat-affected zone to slow the rate of solidification of said molten weld pool, thereby enabling formation of a substantially porosity-free weld bead joining said members. - View Dependent Claims (2, 3, 4, 5)
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6. A method of forming a linear weld between upper and lower members composed of aluminum or magnesium, said method comprising:
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positioning said upper and lower members together in contact between facing surfaces thereof to expose a first outer surface of said upper member to laser irradiation;
moving a welding laser beam in a path over said first outer surface, said welding laser beam having an energy and width to progressively melt a trough of molten metal to a depth through said upper member and into said lower member, said molten metal in said trough having a void filled with gas, and said molten metal re-solidifying into re- solidified metal after the passage of said welding laser beam; and
heating in and around said trough to slow the rate of solidification of said molten metal into said re-solidified metal, thereby preventing entrainment of said gas within said re-solidified metal. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of improving the quality of a laser weld joining an assembly of members, said method comprising:
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moving a welding laser beam in a path over said assembly, said welding laser beam having an energy and width to progressively melt a trough of molten metal to a depth through said upper member and into said lower member, said molten metal in said trough having a void filled with gas, and said molten metal re-solidifying into re-solidified metal after the passage of said welding laser beam; and
directing heat from a heating source toward said trough of molten metal and in accordance with said path so as to widen a heat-affected zone around said trough for slowing the rate of solidification of said molten metal into said re-solidified metal, thereby preventing entrainment of said gas within said re-solidified metal. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification