METHOD FOR REPAIRING WELD BEAD MACHINED PART OF PLATED ELECTRIC RESISTANCE WELDED STEEL TUBE

摘要

PURPOSE:To repair an electric resistance welded steel tube with high corrosion resistance at the low cost by forming a thermal-sprayed layer in arc thermal spraying repair in the reduced pressure of a weld bead machined part of the electric resistance welded steel tube by controlling with predetermined thermal spraying conditions. CONSTITUTION:When a weld bead of the electric resistance welded tube is machined and arc thermal spraying repair in the reduced pressure is carried out by using a metal wire for thermal spraying, the relation between the feed rate per time of the metal wire for thermal spraying and the thermal spraying voltage to improve external appearance of the thermal-sprayed layer for every travel speed of a plated steel strip is obtained in advance and both of these are controlled to form the thermal-sprayed layer continuously. Consequently, it can be easily carried out to thermally spray metal for thermal spraying with optional thickness on the weld bead machined part of the plated electric resistance welded steel tube to repair it and the plated electric resistance welded steel tube with high corrosion resistance can be manufactured at the low cost.