References
- Hoffmeister , H . ‘Closed‐loop welding process using detection of tracers in the arc to control root penetration’ . German Patent DE 3717710A1 . 1987 .
- Hoffmeister , H . 1989 . ‘Controlling root penetration in TIG welding by means of tracers in the arc’ . Collected communications, int conf on ‘Materials assembly’ . March 1989 . pp. 169 – 175 . Helsing0r, , Denmark : European Materials Assembly Institute . JOM 4
- Worm , H U , Röntgen , K and Golloch , A . 1988 . ‘Concentration‐controlling sensor technique’ . Schweissen und Schneiden , 40 (10) : 510 – 513 .
- Rüdiger , J . 1987 . ‘Study of gravity's influence on the arc welding process’ , Armed Forces University . Doctoral thesis
- Hoffmeister H, Dietrich S and Huismann G: ‘The welding of duplex stainless steel pipes by front face penetration control using arc tracers’. Publication pending