A Study on Large Area Roll Projection Welding for Metallic Sandwich Plate : Part 1 - Process Monitoring

Ahn, Junsu; Kim, Jong-Hwa; Na, Suck-Joo; Lim, Jiho

Journal of KWJS 2009;27(3):85-91.
Published online July 6, 2009.

금속 샌드위치 판재 대면적 롤 프로젝션 용접에 관한 연구 : Part 1 - 공정 모니터링

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A Study on Large Area Roll Projection Welding for Metallic Sandwich Plate : Part 1 - Process Monitoring

Junsu Ahn, Jong-Hwa Kim, Suck-Joo Na, Jiho Lim

Abstract

A roll projection welding machine is introduced to fabricate metallic sandwich plate consisting of a structured inner sheet with projection-like shape and a pair of skin sheets. To fabricate the metallic sandwich plate of consistent and good quality, two process monitoring methods are introduced; dynamic resistance monitoring and skin sheet temperature monitoring. Dynamic resistance monitoring has no time delay but gives only averaged value over plate width. Skin sheet temperature monitoring has certain amount of time delay but is good for predicting weld quality of specified position. By the two complementary monitoring methods, the characteristics of the new welding process is successfully understood.

Key Words: Metallic sandwich plate, Roll projection welding, Inner structure, Roll electrode, Process monitoring