| 摘要 |
PURPOSE:To obtain a uniform bead with high quality and obtain a tank-like part with high airtightness by forming a joint so that the surface of a cover plate is located nearer to the MIG torch side than the opening surface of the tank proper. CONSTITUTION:A surge tank 1 is formed by MIG-welding a cover plate 3 made with an aluminum extended plate to the tank proper 2 made by die-casting aluminum. In welding the cover plate 3, the surface 12 of the cover plate 3 is made higher than the surface 14 of the thick section 13 and is located near to the MIG torch 4 side when the cover plate 3 prior to welding is matched with the tank proper 2. Thereby, the cover plate 3 at a higher position is first dissolved, and the heat transfer to the opening surface side of the tank proper 2 and dissolution quantity can be kept little to the utmost. |
