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2nd Feb 2019, 07:59 PM #1Novice
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How to adjust burn back on Unimig Razor weld Smart Set 205
Hi, I can't for the life of me work out how to adjust the burn back feature on the Unimig Razor weld Smart Set 205, any help would be appreciated? Currently when using the Mig setting, when I release the trigger about 7cm of wire comes out.
Thanks Penny
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2nd Feb 2019, 09:20 PM #2Most Valued Member
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Hi Penny, you might have it on 4T, try it on 2T
cheers, shed
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3rd Feb 2019, 07:17 AM #3Philomath in training
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I also wonder if you are using a new roll of wire, whether the spindle tension needs to be increased slightly. The inertia that the roll has may cause it to travel on a little after it is meant to stop. Just a thought - I'm a TIG person myself.
Michael
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3rd Feb 2019, 10:23 AM #4Novice
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3rd Feb 2019, 10:32 AM #5Novice
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Hi Michael, thanks for thr tip, it is new spool wire and new welder. Played with wire tension too loose (1) no contact and no wire, tried in 1/2 turn increments until I got spark but then had same result with excessive wire run out post release of trigger. Any other suggestions
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3rd Feb 2019, 12:12 PM #6
Hi PennyN and welcome to the Forums.
Setting up the wire feed on a new machine by an inexperienced welder can be difficult. People new to solid wire welding do not realise wire feed settings are more complicated than just setting amperage as per stick welding.
There are some addittional factors that need to be considered before setting the burn back.
Some factors that impact upon this process are:
* An extremely good earth connection- shiny base metal to clean earth return-very important.
* Check or adjust the drag tension nut/spring assembly on the wire coil spindle. This was previously mentioned and it is important to know the the coil spool must be set to where it won't overoll when trigger is released or won't be too tight and drag against the momentum of the wire feed wheels.
*Set the wire feed and voltage control. I recommend a look at the Miller site https://www.millerwelds.com/resource...ect-parameters
*Wire feed rolls set at a suitable pressure. Progressively loosen the wire drive wheel tensioner screw until you are just able to grip the wire between thumb and forefinger as the wire is passing through the rolls.
You should be able to make the wire slip in the rolls and stop wire travel outright.
The burnback setting is relative to the particular metal thickness/wire feed settings so, therefore, should be adjusted only after all of the above have been checked or adjusted.Burnback is simply supplying the wire with electric current for a small length of time. Not knowing your machine I would say somewhere between low and half way setting is a good place to begin.
I hope this helps you
Grahame
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3rd Feb 2019, 02:42 PM #7Diamond Member
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- Aug 2006
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- Melbourne
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I just had a look through the manual and there seems to be no adjustable burn back function on this welder.
There is switch inside the wire feed compartment to select spoolgun/standard Is it set to standard?
If you disconnect the wire from the drive rolls and press and release the trigger, do the drive rolls stop rotating pretty much instantly or do they still rotate for a little while?
Did you buy this machine new and has it always had this issue?
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3rd Feb 2019, 07:33 PM #8Novice
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- Feb 2019
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Hi, brought it new, the Unimig rep is going to do a home visit, i got a whole new trigger and had the same problem. Hopefully they will fix it. Thanks for your reply
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3rd Feb 2019, 07:39 PM #9Novice
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Hi Grahame, thanks for your post and the effort you put into it, i am glad ro say that I did problem solve with everything you said and then a friend who is a welders checked everything and all is good. A rep from the company is going to come and visit. I went back to where I brought it and they thought it might be the trigger on the mig touch but a new touch but still had the same issue.
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3rd Feb 2019, 07:43 PM #10Diamond Member
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- Melbourne
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yeah to me it is sounding like a pcb fault. It's good to know that the Unimig rep is coming down to have a look.
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3rd Feb 2019, 07:57 PM #11Diamond Member
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- Jun 2010
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6th Feb 2019, 10:22 PM #12
yep no burn back adjustment on this machine, my machine(205ss) stops with very little stick out half an inch at most... def something wrong with it
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7th Feb 2019, 10:51 AM #13Novice
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- Canberra
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Hi Harry, A Unimig tech rang and gave me the secret sequence to adjust the burn back and it work, it was set for 3 and at 0 it gives me the amount I need. Thanks
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7th Feb 2019, 02:20 PM #14Golden Member
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7th Feb 2019, 04:07 PM #15Diamond Member
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Why should it be a secret, shouldn't it be documented in the manual if it is possible to do?
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