The capacitor I found had a shunt resistor already there, drains the cap in about 3 seconds. The resistor drains the capacitor after welding, otherwise the wire is still grounded and your ground clamp is still hot! Some guys on their conversion discharged the capacitor by touching the wire to the ground clamp expect a nice spark. Found a Siemens electrolytic cap rated at 40V and 47,000 uF for $25 delivered.Īnother important component is a shunt resistor across the two leads of the capacitor. I found a number of eBay sources for the rectifier rated at 1000V and 100A for $10. The videos I watched recommended a minimum 47,000 uF electrolytic capacitor with 30V minimum rating (welder outputs 28V). The capacitor smooths out the “hills” to a relatively straight line or DC output. The rectifier takes the sine wave AC and flips the negative wave to the positive side so the output looks like “hills” running from 0V to peak voltage and back down, then back up again. The two pieces of hardware needed are a full-wave rectifier and an electrolytic filter capacitor. I did a little web research, watched a few YouTube videos and found that it’s fairly easy to convert these units from AC to DC.
All other HF wire feed welders are DC if that tells you anything. Current flows back & forth from the puddle to the wire which causes the flux-core wire to spatter even more than DC flux-core wire welding. Problem with the stock welder is it’s AC output, not DC. Penetration is poor and there is a lot of spatter. But as my dad constantly told me as a kid “you get what you pay for”.īottom line is the welds look terrible.
#CENTURY 90 AMP FLUX CORE WELDER PLUS#
They’re probably not a bad deal for the occasional weekend welding project, plus the 110V portability is nice. I have to admit to looking at them too, especially when they go on sale for under $90. I have a buddy who impulse bought a Harbor Freight 90A flux-core wire feed welder.
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