Manual arc welding with coated electrode or MMA (manual metal arc welding), also know as Shielded metal arc welding (SMAW) is suitable for vertical seal, has high penetration in all positions and gives reasonable mechanical properties.

Arc welding has certain advantages over other methods.

It is faster due to the high concentration of heat generated and therefore produces less distortion at the junction.

In some cases fusible electrodes, which are filler metals in the form of rods or flux coated bare used; in other cases a refractory tungsten electrode is used and the filler metal is added separately.


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