Welding Techniques & Process Control Flashcards

In SAW, what effect does increasing travel speed have on the weld bead?

Answer: Narrower bead with less penetration

Higher travel speed reduces heat input per unit length, resulting in a narrower bead with shallower penetration.

Which SAW technique involves two electrodes fed simultaneously into a single weld pool?

Answer: Twin-wire SAW

Twin-wire SAW uses two electrodes connected to the same power source, feeding into a single molten pool to increase deposition rate.

What is the primary purpose of flux backing in SAW of single-sided groove welds?

Answer: To support the molten pool and form a sound root bead

Flux backing supports the weld pool on the root side, preventing burn-through and producing a fully fused root bead.

In tandem SAW, the leading electrode is typically set to which polarity to maximize penetration?

Answer: DCEP (DC electrode positive)

DCEP on the leading electrode concentrates heat at the workpiece, maximizing penetration into the joint.

What welding parameter most directly controls the width of the flux coverage zone in SAW?

Answer: Flux hopper height above the work

The height of the flux hopper above the workpiece determines how wide the flux pile spreads, affecting coverage width.

When welding with AC in SAW, what advantage does it offer over DCEP for multi-wire applications?

Answer: Reduced arc blow between adjacent arcs

AC alternating polarity reduces magnetic arc blow interference between adjacent electrodes in multi-wire setups.

A welder notices the slag is difficult to remove after SAW. What is the most likely cause?

Answer: Incorrect flux type for the base metal

Using a flux chemically mismatched to the base metal can produce slag with poor release characteristics.