Abstract: A method for manufacturing a dissimilar material joint structure by joining a steel material and an aluminum or aluminum alloy material having a low-temperature spray coating made of a metal powder capable of being joined to the steel material on at least a part of a surface of the aluminum or aluminum alloy material. The method includes overlapping the aluminum or aluminum alloy material and the steel material such that the low-temperature spray coating and the steel material face each other and emitting a laser beam from a steel material side. Where a region to be irradiated with the laser beam includes a first region where at least the steel material and the low-temperature spray coating are melted, and a second region where the steel material and the low-temperature spray coating are not melted in a peripheral portion of the first region.

Abstract: A method for producing a resistance-welded member made of three or more sheets including a plated steel sheet includes: a main energizing by performing energization with a first current value while compressing the steel sheet with a first compressive force to form a nugget; a subsequent energizing by performing, after the main energizing, energization such that the current value gradually decreases from the first current value while compressing with a second compressive force greater than the first compressive force; and holding an electrode while maintaining the second compressive force after the subsequent energizing. The second compressive force and a total sheet thickness, compression rise delay time, and a downslope time and an electrode holding time satisfy respective predetermined conditions.

Abstract: A method for producing a resistance-welded member made of three or more sheets including a plated steel sheet that includes: a first energizing with a first current value while compressing the steel sheets with a first compressive force to form a nugget; a subsequent energizing of, after the first energizing, energizing with a second current value smaller than the first current value while compressing the steel sheets with a second compressive force greater than the first compressive force; and holding an electrode by maintaining the second compressive force after the subsequent energization. The second compressive force and a total sheet thickness, the first current value and the second current value, and a subsequent energization time and an electrode holding time satisfy predetermined conditions respectively.

Abstract: Provided is a method for producing a lithium-containing solution that allows increasing a content rate of lithium in a solution after an eluting step, and suppressing an amount of an eluted solution used in a process after the eluting step, thus suppressing production cost of lithium. A method for producing a lithium-containing solution includes an adsorption step of bringing a lithium adsorbent obtained from lithium manganese oxide in contact with a low lithium-containing solution to obtain post-adsorption lithium manganese oxide, an eluting step of bringing the post-adsorption lithium manganese oxide in contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step of oxidating manganese to obtain a lithium-containing solution with a suppressed manganese concentration. The adsorption step, the eluting step, and the manganese oxidation step are performed in this order, and the acid-containing solution includes the eluted solution with acid added.

Abstract: A method for manufacturing a dissimilar metal joint product including joining a first member made of non-ferrous metal and having an end surface and a first surface adjacent to the end surface and a second member made of steel, the method includes: spraying a metal powder capable of being joined to the second member to the end surface and the first surface of the first member at a low temperature and at a high speed to form a coating to extend over the end surface and the first surface; disposing the first member and the second member such that the coating and the second member are close to or contact with each other; and performing fillet welding between the coating and the second member.

Abstract: A method for manufacturing a joint structure of dissimilar materials, the method includes: forming a low-temperature thermal spray coating on at least a part of a surface of an aluminum or aluminum alloy material by low-temperature thermal spraying a metal powder of at least one metal selected from the group consisting of pure iron, carbon steel, stainless steel, nickel, a nickel alloy, cobalt, and a cobalt alloy; overlapping the aluminum or aluminum alloy material and a steel material such that the low-temperature thermal spray coating and the steel material face each other; and joining the aluminum or aluminum alloy material and the steel material by laser a welding from a steel material side, in which the joining is performed under welding conditions in which a fusion zone is formed in the steel material, the low-temperature thermal spray coating, and the aluminum or aluminum alloy material.

Abstract: A method for manufacturing a dissimilar metal joint product includes: spraying a metal powder capable of being joined to a steel material to at least a part of a surface of an aluminum or aluminum-alloy material at a low temperature and at a high speed to form a coating thereon; disposing the aluminum or aluminum-alloy material and the steel material such that the coating and the steel material face each other; and performing brazing using a brazing material or welding using a welding material between the coating and the steel material.

Abstract: A joint structure, includes: a first member including a high tensile strength steel; and a second member including a high tensile strength steel and superposed on the first member, the first member and the second member being resistance welded to each other, in which a gap between the first member and the second member is between 0 mm and 3 mm, a nugget is not formed at a joint portion between the first member and the second member, or when the nugget is formed at the joint portion between the first member and the second member, a diameter D1 of the nugget satisfies D1<5 mm, and a decarburized layer is provided on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed.

Abstract: A joint structure formed by resistance welding a plurality of superposed steel sheets includes a high tensile strength steel sheet having a tensile strength of at least 590 MPa and containing a chemical component having a carbon equivalent Ceq of at least 0.53%. The high tensile strength steel sheet has a decarburized layer between a base plate and a galvanized layer formed on at least one of a surface on a superposition surface side and a surface on a welding electrode side of the high tensile strength steel sheet, or has a decarburized layer on a superposition surface of the high tensile strength steel sheet adjacent to a galvanized layer of a galvanized steel sheet to be superposed. The decarburized layer has a thickness of at least 5 ?m and at most 200 ?m, and the carbon equivalent Ceq is a value defined by a formula: Ceq=C+Si/24+Mn/6.

Abstract: A joint structure, includes: a first member including a high tensile strength steel; a second member including a high tensile strength steel and superposed on the first member; a surface soft layer formed on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed; a molten-solidified portion formed by melting and solidifying the first member and the second member; and a heat affected zone formed around the molten-solidified portion, in which the surface soft layer has a total thickness of 5 ?m to 200 ?m, and the molten-solidified portion has a carbon amount of 0.21 mass % or more, and a maximum Vickers hardness of the surface soft layer in the heat affected zone is 100 Hv to 500 Hv.

Abstract: The present invention relates to a method for manufacturing a joint structure of dissimilar materials. The method includes forming a low-temperature thermal spray coating on at least a part of a surface of an aluminum or aluminum alloy material by low-temperature thermal spraying a metal powder of at least one metal selected from the group consisting of ferritic stainless steel, austenitic stainless steel, and ferritic and austenitic two-phase stainless steel, overlapping the aluminum or aluminum alloy material and a steel material such that the low-temperature thermal spray coating and the steel material face each other, and joining the low-temperature thermal spray coating and the steel material by a laser welding from a steel material side.

Abstract: A joint structure including a first member, a second member superposed on the first member, a steel insertion member, and a welded part formed on an insertion tip of the insertion member. Each of the first member and the second member includes a high tensile strength steel. The steel insertion member is held by the second member in a state of having been inserted toward a superposition surface between the first member and the second member from a surface of the second member opposite the superposition surface. A carbon equivalent Ceq of the insertion member is lower than a carbon equivalent Ceq of the second member, where Ceq=C+Si/30+Mn/20+2P+4S.