Study on the Frition Welding Characteristics of Oxygen Free High Conductivity Copper

J. Ocean Eng. Technol. 1997;11(1):10-15.

무산소동의 마찰 용접 특성에 관한 연구

정호신,소전강

부경대학교 공과대학,나고야대학 공학부

Keywords: OFHC Copper, Friction Welding, Friction Pressure, Upsetting Pressure, Friction Heat Input

핵심용어: 무산소동, 마찰용접, 마찰압력, 업셋 압력, 마찰 용접 입열량

Abstract

Copper and its alloy had been used widely because of its pronouncing characteristics on their high thermal and electrical conductivity. Various fusion welding methods, such as SMAW, SAW, GTAW, GMAW, Electroslag welding amd so on are applied to weld copper and its alloy. But fusion welding of copper has so many welding problems. THe most serious problems were poor penetration amd high thermal contration stress due to its high thermal conductivity and porosity could be formed by rapid cooling rate of fusion welding. In order to avoid such fusion welding problems, preheating, peering and heat treatment must be applied to obtain sound weld joint of copper. But preheating induce another welding problem such as grain coarsening of weld heat affected zone. This grain coarsening reduces ductility and strength of weld joint. In this view of point, friction welding of copper is triedm to obtain sound weld joint of copper by reducing metallurgical problems. This study introduced new concept of heat input for evaluating the friction weldability of copper. As a result, weldability of copper could be evaluated by this new concept of heat input.