| 摘要 |
PURPOSE:To improve yield by fitting a covering tubular material onto a base material, grasping both materials flatly so as to bring the same in tight contact with each other without any clearance and sealing both ends then subjecting the materials to diffusion welding thereby preventing the inflow of air and performing diffusion welding in an ordinary heating furnace. CONSTITUTION:A stainless steel pipe 21 is fitted as a covering tubular material on a round barlike copper base material 20, and both are grasped under pressure with press dies 22, 23 whereby the base material and the covering material are plastically deformed to a flat shape. Such end plates 25 which prevent the inflow of air are welded to both ends of the cladding blank metal 24 formed flatly in tight and close contact with each other to seal both ends. The blank material is put into a heating furnace 26 for the purpose of joining, and a required weight 27 for applying the face pressure necessary for joining is placed thereon during heat, whereby the copper base material 20 and the stainless steel pipe 21 are diffusion-welded. The diffusion welding is accomplished in the same way as mentioned above by deforming both materials plastically to a flat shape with a pair of rolls having the calibers of a flat section, and sealing both ends then heating the materials and rolling the same again. |
