| 摘要 |
<p>PURPOSE:To improve the reliability of welded parts for manufacturing an elbow- shaped draft tube liner for a water wheel, a pump water wheel, or other hydraulic machinery by welding a number of divided pieces bent into U-shapes onto side parts for jointing, bending inner and outer face parts, and welding them onto the side parts along side end edges. CONSTITUTION:Divided pieces 31-33 and so on bent into U-shapes at a fixed width are welded onto the first side part 21 for jointing. Similarly, divided pieces 41-43 and so on bent into U-shapes at the fixed width are welded onto the second side part 22 for jointing. Inner face parts 23 and outer face parts 24 are previously bent to meet with bent lines of side end edges of the first side part 21 and the second side part 22, and welded to the first side part 21 and the second side part 22 along the side end edges. This method permits to construct a tube liner in one body.</p> |
