Development of Digital Carriage for Continuous/Intermittent Welding

J. Ocean Eng. Technol. 2002;16(1):64-70.

디지털식 연속/단속 용접용 캐리지 개발

감병오,김동규,김광주,김상봉

부경대학교 대학원 학연기계공학,한국가스공사 연구개발원,부경대학교 기계공학부,부경대학교 기계공학부

Keywords: Pulse Width Modulation, High Speed Input, High Speed Output, Continuous Welding, Intermittent Welding, Stray Inductance

핵심용어: 펄스폭 변조, 고속입력, 고속출력, 연속용접, 단속용접, 부유용량

Abstract

This paper shows the results of the development of a small size of digital type continuous and intermittent welding auto-carriage based on microprocessor (Intel 80196KC) for welding process with long welding line. The developed welding auto-carriage loads welding torch and tracks welding line. It is an automaton largely used for welding process with a lot of long welding lines such as shipbuilding and structure. Most traditional auto-carriages have been developed based on analog circuit for open loop control. So this analog circuit welding auto-carriage cannon control welding speed. Specially welding auto-carriage for intermittent welding condition is so complicated and has the low precision of control performance in welding distance and non-welding distance. The auto-carriage developed in this paper has the following characteristics: It has not only functions of traditional carriage but also functions such as pseudo-welding process of big iron structures, intermittent welding in order to limit heat for welding thin plates, crater treatment of the final step of welding, acceleration at the initial step of welding and deceleration in the final step of welding. The main control board of auto-carriage, power supply system and DC motor drive wee developed and manufactured. The welding speed and the welding distance of the developed auto-carriage are controlled accurately by feedback control using photo-sensor. Hardware and software robust against the heat and noise produced on the welding process are developed.