Abstract: A heat exchanger includes: a copper pipe forming a refrigerant circulation passage; and a plurality of fins arranged at positions spaced apart from each other along one direction and coupled to an outer circumferential surface of the copper pipe, wherein the copper pipe includes: a plurality of straight tubes extending along the arranged direction of the plurality of fins; and a plurality of return bends connected to one end of one of the plurality of straight tubes and one end of another one of the plurality of straight tubes by welding, wherein burrs having a circumference greater than an outer diameter of each straight tube are formed at both ends of the plurality of straight tubes, a distance between a rim of the burr and an outer surface of the straight tube is 0.4 mm to 1.8 mm.

Abstract: A heat exchanger includes: a copper pipe forming a refrigerant circulation passage; and a plurality of fins arranged at positions spaced apart from each other along one direction and coupled to an outer circumferential surface of the copper pipe, wherein the copper pipe includes: a plurality of straight tubes extending along the arranged direction of the plurality of fins; and a plurality of return bends connected to one end of one of the plurality of straight tubes and one end of another one of the plurality of straight tubes by welding, wherein burrs having a circumference greater than an outer diameter of each straight tube are formed at both ends of the plurality of straight tubes, a distance between a rim of the burr and an outer surface of the straight tube is 0.4 mm to 1.8 mm.

Abstract: The present disclosure relates to an aluminum alloy for die casting, more particularly, to an aluminum alloy for die casting which has high corrosion resistance, strength and castability. The embodiments of the present disclosure provide an aluminum alloy for die casting comprising a composition ratio having an aluminum (Al) content which occupies almost the composition ratio of the aluminum alloy; a magnesium (Mg) content of 2.5˜3.0%; a silicon (Si) content of 9.6˜0.5%; a zinc (Zn) content of 0.5% or less; and a copper (Cu) content of 0.15% or less.

Abstract: A heat exchanger includes: a copper pipe forming a refrigerant circulation passage; and a plurality of fins arranged at positions spaced apart from each other along one direction and coupled to an outer circumferential surface of the copper pipe, wherein the copper pipe includes: a plurality of straight tubes extending along the arranged direction of the plurality of fins; and a plurality of return bends connected to one end of one of the plurality of straight tubes and one end of another one of the plurality of straight tubes by welding, wherein burrs having a circumference greater than an outer diameter of each straight tube are formed at both ends of the plurality of straight tubes, a distance between a rim of the burr and an outer surface of the straight tube is 0.4 mm to 1.8 mm.

Abstract: The present disclosure relates to an aluminum alloy for die casting, more particularly, to an aluminum alloy for die casting which has high corrosion resistance, strength and castability. The embodiments of the present disclosure provide an aluminum alloy for die casting comprising a composition ratio having an aluminum (Al) content which occupies almost the composition ratio of the aluminum alloy; a magnesium (Mg) content of 2.5˜3.0%; a silicon (Si) content of 9.6˜0.5%; a zinc (Zn) content of 0.5% or less; and a copper (Cu) content of 0.15% or less.