SAW Electrical Systems & Wiring 2

Question 1

What is the purpose of the inductance control on a SAW power source?

Accepted Answer

To control the rate of current rise and arc stability

Answer

Inductance controls the rate of current rise during short circuits, smoothing arc behavior and reducing spatter in SAW operations.

Question 2

Which type of electrical connection produces deeper penetration in SAW: electrode positive (DCEP) or electrode negative (DCEN)?

Accepted Answer

DCEP produces deeper penetration

Answer

DCEP (reverse polarity) drives more heat into the base metal, resulting in deeper weld penetration compared to DCEN.

Question 3

A SAW system shows erratic wire feeding and unstable voltage readings. The most likely electrical cause is:

Accepted Answer

Worn or contaminated contact tip causing poor electrical contact

Answer

A worn or contaminated contact tip creates inconsistent current transfer to the electrode wire, causing erratic arc behavior.

Question 4

In a SAW multi-wire system, the trailing electrode is typically connected to:

Accepted Answer

AC to reduce arc blow interference between electrodes

Answer

The trailing electrode in multi-wire SAW is typically on AC to minimize magnetic arc blow caused by interaction between DC magnetic fields.

Question 5

What does the term 'arc voltage' specifically measure in a SAW electrical circuit?

Accepted Answer

The voltage drop across the welding arc between electrode tip and weld pool

Answer

Arc voltage is the actual voltage measured across the arc gap between the electrode tip and the molten weld pool.

(SAW) Submerged Arc Welding Certification Practice Test