Рубрика: Introduction to Welding Technology

CHARACTERISTICS DESIRED IN ELECTRODES FOR MMA WET — WELDING

Flux covering for underwater welding electrodes should have some special characteristics in addition to the usual characteristics required in air welding. Because of arc constriction effect, the current density of underwater arc column is more and therefore deeper penetration is obtained in underwater welding. The arc should therefore have soft behaviour. Purely cellulosic electrodes are […]

UNDERWATER MMA ‘WET’-WELDING PROCESS DEVELOP­MENT

Deposition of stringer beads (see Fig. 15.7) has, generally, been recommended in the literature. Necessary strength can be achieved by superimposing additional beads. The advan­tages of stringer-bead technique include: 1. Easy control over travel speed. 2. Uniform bead surface. 3. Good arc stability. 4. Reduced risk of slag inclusions. 5. Reduced chances of undercutting. 6. […]