Refurbished Welding Power Sources & Rectifiers - Great Value

Power source types.

The most common welding power sources fit into a few different types, such as transformers and rectifiers. 
Transformers swap the power from the mains. Changing it from a low current and high voltage, to a high current and low voltage. The output current and voltage are set by the welder, based on the welding work they are carrying out. Rectifiers are sometimes used alongside transformers to convert the AC into DC.
Generators like diesel welders, are a way of producing electricity for welding on site. Some generators are mains powered. Yet the electricity produced can be a different voltage and current, without the need for a transformer.
Other types of power sources exist, such as inverters. These are mains-powered, and offer a lightweight, portable solution for light-duty welding.

Welding applications that need a power source supply.

All welding applications need a welding power source. However, different forms of welding need different power supplies. Each requires a different level of electrical current to work correctly. The most basic form is manual arc welding. Also known as stick welding, shielded metal arc welding (SMAW), MMA and MMAW. Heavy duty applications include submerged arc welding and flux cored welding.

What type of Stick welder works best for all-round use?

DC welding offers advantages over AC for most stick welding applications. These include easier starts, fewer arc outages and sticking, and less spatter/better looking welds. It also offers easier vertical up and overhead welding, is easier to learn, and provides a smoother arc. DC reverse polarity (electrode positive) provides about 10% more penetration at a given amperage than AC welding. While DC straight polarity (electrode negative) welds thinner metals better.

Does AC output have any advantages?

Yes, if you need to weld on material that's become magnetized from friction. For example when hay, feed or water constantly rub against a steel part like a gate or feeder. A DC output won't work because of "arc blow," where the magnetic field blows the molten metal out of the weld puddle. An AC output alternates between polarities, enabling you to weld magnetized parts.

How big of a machine do I need?

A 225 - 300 amp machine handles almost anything the average welder will encounter. Light duty stick welding procedures need 200 amps or less, making welding inverters ideal. To weld material thicker than 3/8 in., simply make multiple passes. Professionals use this technique, even when welding on 1 in. structural steel.

I see the word "duty cycle" on product spec sheets, what does that mean?

Duty cycle is the number of minutes out of a 10-minute cycle a welder can operate. For example, the Thunderbolt XL creates a 200 amp DC output at 20% duty cycle. It can weld continuously at 200 amps for two minutes. Then must cool for eight minutes to prevent overheating. Click here for more information on duty cycle.

Do I have to remove rust or oil before welding?

Stick welding is more forgiving on unclean conditions, but it never hurts to clean parts with a wire brush, or grind off excess rust. If you prepare well and have average welding ability, you can make a sound weld. Yet, even great welding skill cannot overcome poor preparation for certain applications. As it can lead to cracking, lack of fusion and slag inclusions.

Arc welding tips and tricks.

Shellfish can make you a better welder; think about CLAMS. Current setting, Length of arc, Angle of electrode, Manipulation of the electrode and Speed of travel.  If you're learning the stick process (Shielded Metal Arc Welding), remembering these five points will improve your welding technique. Take a minute to review the above advice, especially if you've never struck an arc or are still debating which machine to buy. Or Contact Us, with over 60 years buying and selling arc welders we can tell you the good and bad points of them all.