Patent ID: 7716834
Filing Date: 2010-05-18
Classification: B23K,E21B,Y10T

Abstract:
1. A method for manufacturing a screen, characterized in that said screen comprises a base pipe with multiple penetrated holes on pipe wall, a filter sheath and a jacket with multiple holes; wherein the filter sheath is placed on and covers the outside of the base pipe and the jacket is placed on and covers the outside of the filter sheath, and the welding method comprises the steps: step 1: wrapping the outside wall of a support sheath with a metal filter net and fixing the metal filter net to the outside of the support sheath by way of resistance welding, such that the metal filter net completely covers all penetrated holes of the support sheath to form the filter sheath; step 2: fixing said filter sheath to the outside wall of the base pipe and the filter sheath completely covering all penetrated holes of the base pipe; step 3: putting said jacket round the outside of the filter sheath and fixing it to the outside of the base pipe, such that said jacket completely covers the outside surface of filter potion of the filter sheath;