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Slow heating and cooling can avoid the risk of hardening. Metal thicknesses up to about 6 rom can be welded with an I-joint. Speed, as only one pass is needed. Filler wires can be changed without having to pause for grinding. Good control of melting, as the welder can see at all times that he has the desired pear-shaped opening in the bottom of the melt pool. Root defects are avoided by taking care to ensure good burn-through. Pipes and tubes often have to be welded in very confined spaces. In such cases, gas welding is often preferable, bearing in mind the less bulky protective equipment required (goggles, as against a normal arc welding helmet or visor, and compact torch) to perform the work.
The high productivity, in combination with a higher current and larger weld pool, mean that welding must be carried out in the most favourable horizontal position. 17 Rapid Arc and Rapid Melt can be used with considerably higher welding data than with conventional short arc or spray arc welding. ) Tandem and twin wire welding Another way of improving productivity and raising the welding speed is to use double filler wires. Both wires can be connected to the same power unit, which means that they share a common arc.
The resulting substantial expansion excludes the surrounding air from the arc and weld pool. ¥ ~r::: 0 ~ 8. 16 Deposition rate when welding carbon steel. 6 mm. The range of weld metal grades is wide, and is constantly increasing. In particular, the range of cored filler wires for use with stainless steel has increased. Welding speed is higher with cored wires than when using coated electrodes (MMA). As the current flows through the outer wall of the wire, current density is higher, with a correspondingly higher rate of melting of the metal.