Question about Campbell Hausfeld MIG / Flux Core Wire Feed Welder

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Square Wave Question

What is Square Wave?

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Square Wave refers to the shape of the voltage cycle in a welding arc. In an AC wave, a typical sinusoidal or sine wave, changes the voltage from positive to negative gradually, although many times a second. This means the voltage will not be consistent and at times will actually go through zero. Square Wave, on the other hand, changes the voltage from positive to negative almost instantly, making for a much smoother and more stable welding arc. This is particularly important when welding aluminum and when considering aspects like cleaning and penetrating action.

Posted on Aug 27, 2008

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How do I fit legs made from same 25mm square tube as top section from moving from 90 degree angle as I weld ?


couple of methods
use a section of the square tube as a block across the frame and clamp to the leg and to the frame the leg is being welded to ( that holds the leg square to the frame
now tack weld along the length and not across the frame
the problem is that when you weld across with out tacking both sides first , as the weld cools down it pulls the leg in that direction and the trick is to prevent that action by tacking both sides first before welding properly
welding across the tube will tend to bend the frame as well and by welding along the sides of the frame after tacking inside and outside first that stops the from from bending
mostly a weld on both sides of the frame rail onto the leg will be sufficient as it is not really necessary to weld all the way around the leg

Apr 25, 2016 | Welding Tools

2 Answers

How do I weld upright posts on square tube base so that same size square tube stays 90 degree when tacked.


Anytime you weld something or even tack anything together, your joints are going to move some. You could position your pieces to compensate for this or you could clamp them down. But no matter what, when that weld puddle solidifies, it will pull and the stresses exerted on your work piece can be pretty high. If you can't clamp it in place to minimize movement, try tacking one spot on one side, then--using a your favorite hammer--influence your piece back straight and tack the other side. Once you have solid tacks that are going to hold your piece as square as you can make them, then weld it out, alternating sides and direction of travel. Of course minimize heat input as much as possible. Travel speed has more to do with heat input than amperage or voltage in many cases. Its a little hard to give you specific recommendations on your project without knowing more about your set up there. So tack, straighten, tack, straighten, tack straighten and so one...then weld it out.

Apr 25, 2016 | Welding Tools

1 Answer

Lincoln square wave tig


The contactor has failed or a fuse is blown. You need to take this one to the local welding supply shop for service.

Aug 28, 2014 | Welding Tools

1 Answer

Cannot get my gx 620 preditor welder to slow down after welding


I'm going to presume you mean the wire feed does not stop? If so, the problem is in the motor relay which operates on the trigger along with the weld power since most MIGs do not have OCV on the tip until the trigger is depressed. Keep in mind that, besides failure to open, some relays can be held closed due to current leakage or a faulty ground on the electromagnet coil. The issue is like this... your wire feed relay is in parallel with a larger relay to switch on the primary power of the weld transformer. The larger relay is grounded to the same chassis as the ground of the weld output. Because of a failed diode/rectifier that output can include a low voltage AC or half-wave that will bleed across to the motor relay, keeping it on indefinitely. If this is the case, sticking the ground clamp onto an earth grounded water pipe may stop it. If it does, fix the diode or ground connection. Also check the ground of your power cable. The 24vac control voltage transformer should also be checked for ground to the welder chassis.

Aug 19, 2014 | Welding Tools

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I will make about 12 3" passes over 3" square


Nothing's wrong with your gun or machine. Your unit has a duty cycle of 20 percent at 90 amps, meaning that it will work (weld) great for 2 straight minutes and then it needs to cool down for 8 minutes. The duty cycle it is measure in 10 minutes lapses.
All you need to do is to let it cool down, and start again. That's all.

Jan 19, 2011 | Hobart Handler 140 Mig Welder

2 Answers

Mig welding 1/16 thick metal


you should run power between 160-180 to get a godd weld with out burning your work

Jul 01, 2009 | Campbell Hausfeld RBWG202000 NA 70 Amp....

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