Abstract: Provided is a welded member including a welded portion with excellent electrodeposition coating properties and corrosion resistance. The present disclosure may provide a welding member including a gas shielded arc welded portion capable of securing excellent electrodeposition coating properties and corrosion resistance for a welded portion in the automobile industry.

Abstract: An aspect of the present disclosure is to provide a gas shielded arc welding wire capable of imparting excellent fatigue resistance characteristics and resistance to deformation due to residual stress to a weld zone. Another aspect of the present disclosure is to provide a welding member having excellent fatigue resistance characteristics and resistance to deformation due to residual stress of a weld zone, and a method for manufacturing the same.

Abstract: Disclosed is a welded member for plated steel plate having excellent weld zone porosity resistance and fatigue properties and a method of manufacturing the same. The welded member for plated steel plate having excellent weld zone porosity resistance and fatigue properties according to an embodiment of the present invention comprises a weld metal portion formed by arc welding and overlapping a first member and a laminated second member so as to partially overlap the first member, wherein the toe angle (?) of the weld metal portion is 45° or less, and the first member and the second member are plated steel plates.

Abstract: A welding wire for obtaining a giga-grade weld, a welded structure manufactured using same, and a welding method thereof are provided. The welding wire of the present invention comprises: by mass % of the whole wire, 0.08 to 0.15% of C; 0.001% to 0.1% of Si; 1.6 to 1.9% of Mn; 0.015% or less of P; 0.015% or less of S; 4.0 to 5.2% of Cr; 0.4 to 0.65% of Mo, and the remainder being Fe and unavoidable impurities, wherein value X defined by the following relation 1 satisfies the range of 0.7 to 1.1%.

Abstract: One embodiment of the present invention relates to a welded member obtained by overlapping portions of two sheets of base metal and performing fillet welding thereon using weld material, and provides a welded member having excellent fatigue strength of welded portion, and a method for manufacturing same, the welded member comprising base metal, a weld bead and root-reinforcing weld metal, wherein the base metal has a tensile strength of 780 MPa, the weld bead has a toe angle of 160 degrees or greater and the weld bead and the root-reinforcing weld metal have a Vicker's hardness of 280-320 Hv and a fatigue strength of 350 MPa or higher.

Abstract: Provided is a steel material that may be used for arms, frames, beams, brackets, reinforcing materials, etc. of chassis parts of a vehicle and, more specifically, to a high strength hot-rolled steel sheet having excellent workability and a method for manufacturing same. The steel sheet includes: by weight %, 0.1-0.15% of C, 2.0-3.0% of Si, 0.8-1.5% of Mn, 0.001-0.05% of P, 0.001-0.01% of S, 0.01-0.1% of Al, 0.7-1.7% of Cr, 0.0001-0.2% of Mo, 0.02-0.1% of Ti, 0.01-0.03% of Nb, 0.001-0.005% of B, 0.1-0.3% of V, 0.001-0.01% of N, and a balance of Fe and inevitable impurities, wherein tensile strength (TS) is 1180 MPa or more, a product (TS×E1) of tensile strength and elongation is 20,000 MPa % or more, and a product (TS×HER) of tensile strength and hole expandability is 30,000 MPa % or more.

Abstract: A method for welding a zinc coated steel sheet is provided. The method for welding a zinc coated steel sheet of the present invention is a method for welding a zinc coated steel sheet by using a welding material, wherein when welding, the welding current is 150-300 A, a shielding gas is a mixed gas of Ar+10-30% CO2, and the welding polarity is alternately altered so that the welding polarity fraction defined by relational equation 1 satisfies the range of 0.25-0.35.

Abstract: Provided are a flash butt welding member and a flash butt welding method for providing a wheel rim weld part with excellent formability. The flash butt welding member of the present invention satisfies that a weld part has a hardness of 220-270 Hv, and d<0.25T, when d is the closest distance between fine-grained heat affected zones (HAZ) formed at the left and right of the weld part while facing each other and T is the thickness of a weld base metal, and satisfies L/T>2, when the total length of an upset part constituting the weld part is L.

Abstract: Disclosed is a welded member for plated steel plate having excellent weld zone porosity resistance and fatigue properties and a method of manufacturing the same. The welded member for plated steel plate having excellent weld zone porosity resistance and fatigue properties according to an embodiment of the present invention comprises a weld metal portion formed by arc welding and overlapping a first member and a laminated second member so as to partially overlap the first member, wherein the toe angle (?) of the weld metal portion is 45° or less, and the first member and the second member are plated steel plates.

Abstract: A method and system for die compensation and restoration uses high-velocity oxy-fuel (HVOF) thermal spray coating and plasma ion nitriding to compensate for a particular part (damaged part) of a press die that causes formation of fine curves at a door of a vehicle to restore it to its original state. A coating thickness quantification technique may precisely compensate for the damaged part of the die that causes formation of the fine curves at the door of the vehicle in a circular form using HVOF thermal spray coating. A surface of the die may be nitrided using plasma ion nitriding after HVOF thermal spray coating is performed, so as to harden the surface of the die so that wear resistance and fatigue resistance of the die can be greatly improved and the hardfacing or overlay welding efficiency of the die can be increased.

Abstract: A welding joint having excellent fatigue characteristics and a method for manufacturing the same are disclosed. The welding joint having the excellent fatigue characteristics, according to an embodiment of the present disclosure, may include a welded metal formed by welding between a plurality of steel sheets arranged in such a way to overlap each other at a connecting portion between the plurality of steel sheets, and a remolten portion which is formed at an end of the welded metal and whose surface layer has a Vickers hardness value of 200 Hv or greater.

Abstract: A method and system for die compensation and restoration uses high-velocity oxy-fuel (HVOF) thermal spray coating and plasma ion nitriding to compensate for a particular part (damaged part) of a press die that causes formation of fine curves at a door of a vehicle to restore it to its original state. A coating thickness quantification technique may precisely compensate for the damaged part of the die that causes formation of the fine curves at the door of the vehicle in a circular form using HVOF thermal spray coating. A surface of the die may be nitrided using plasma ion nitriding after HVOF thermal spray coating is performed, so as to harden the surface of the die so that wear resistance and fatigue resistance of the die can be greatly improved and the hardfacing or overlay welding efficiency of the die can be increased.

Abstract: A method and system for die compensation and restoration uses high-velocity oxy-fuel (HVOF) thermal spray coating and plasma ion nitriding to compensate for a particular part (damaged part) of a press die that causes formation of fine curves at a door of a vehicle to restore it to its original state. A coating thickness quantification technique may precisely compensate for the damaged part of the die that causes formation of the fine curves at the door of the vehicle in a circular form using HVOF thermal spray coating. A surface of the die may be nitrided using plasma ion nitriding after HVOF thermal spray coating is performed, so as to harden the surface of the die so that wear resistance and fatigue resistance of the die can be greatly improved and the hardfacing or overlay welding efficiency of the die can be increased.

Abstract: A method and system for die compensation and restoration uses high-velocity oxy-fuel (HVOF) thermal spray coating and plasma ion nitriding to compensate for a particular part (damaged part) of a press die that causes formation of fine curves at a door of a vehicle to restore it to its original state. A coating thickness quantification technique may precisely compensate for the damaged part of the die that causes formation of the fine curves at the door of the vehicle in a circular form using HVOF thermal spray coating. A surface of the die may be nitrided using plasma ion nitriding after HVOF thermal spray coating is performed, so as to harden the surface of the die so that wear resistance and fatigue resistance of the die can be greatly improved and the hardfacing or overlay welding efficiency of the die can be increased.