CLOTHES DRYER

A heat exchanger (120) proposed in the present disclosure includes:a copper pipe (121) forming a refrigerant circulation passage;and a plurality of fins (122) arranged at positions spaced apart from each other along one direction and coupled to an outer circumferential surface of the copper pipe (121), wherein the copper pipe (121) includes:a plurality of straight tubes extending along the arranged direction of the plurality of fins (122);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, and coating layers providing corrosion resistance are formed on surfaces of the plurality of return bends, surfaces of the weld zones formed at both ends of each return bend, and surfaces of the burrs.