BRAZED PIPE AND PRODUCTION METHOD THEREOF

摘要

A method of producing a brazed pipe including steps A-D. In step A, a first inclined surface (21) inclined downwardly from the above toward the right end is formed on the top surface of the right-side edge of a blank plate (20) having brazing filler metal layers on the opposite surfaces, and a first flat surface (22) is formed between the first inclined surface (21) and the bottom surface. In step B, a second inclined surface (24) inclined upwardly from the below toward the left end is formed on the bottom surface of the left-side edge of a blank plate (20), and a second flat surface (25) is formed between the second inclined surface (24) and the bottom surface. In step C, the blank plate (20) is formed in a tubular shape, and the both inclined surfaces (21, 24) are brought into surface-contact and the both flat surfaces (22, 25) are brought into contact to obtain a brazed pipe-use tubular body (34). In step D, the both inclined surfaces (21, 24) at the opposite-side edges of the blank plate (20) and the both flat surfaces (22, 25) are respectively brazed to each other by using the brazing filler metal layers of the blank plate (20). The above method can provide a brazed pipe free from step difference on the outer surface.