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  1. #61
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    Quote Originally Posted by jhovel View Post
    Could someone (with a helper) measure the open circuit voltage of their inverter welder, strike an arc with both LH and cellulose rods, and keep measuring the voltage while the bead is being laid down?
    Finally had the chance to give this a try - my little BOC Smootharc 130 set to maximum noise (140A) running a 3.2mm 7018 (I don't have any firesticks). DMM measuring Volts, clamp meter measuring Amps.

    At idle, OCV is 16V. Attempts at striking an arc saw the OCV rise to about 75V before averaging around 20V and 135A during welding. Once the arc was broken, the OCV rose to 75V for about a second before dropping to 16V.

    I've got 2 other welders to try out - just need a bit more messing around to set them up for measuring.

  2. #62
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    Jan 2018
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    Penrith
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    63
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    28

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    Peterbilt, the variable speed Bosch unit certainly sounds promising but I'm afraid the resident 'Minister of Finance' wouldn't be too fussed if I added a fourth angle grinder to my arsenal of power tools ! But, who knows, maybe for Father's day.....refer; https://sydneytools.com.au/bosch-gws...-angle-grinder

  3. #63
    BobL is online now Member: Blue and white apron brigade
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    Quote Originally Posted by Chimbu View Post
    Peterbilt, the variable speed Bosch unit certainly sounds promising but I'm afraid the resident 'Minister of Finance' wouldn't be too fussed if I added a fourth angle grinder to my arsenal of power tools ! But, who knows, maybe for Father's day.....refer; https://sydneytools.com.au/bosch-gws...-angle-grinder
    I'm now up to 6 . . . . so you can then say 4 might be below average
    Green bosch 1 - flap disc,
    Green bosch 2 - thin kerf cutting wheel,
    Blue bosch - wire wheel,
    Ozito - cup wheel,
    Makita - Arbortech carving wheel with TC teeth,
    Arbortech special - with mini carver/sander disc.

    Have been strongly tempted by the brushless Makita portable as my next purchase.

  4. #64
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    Aug 2010
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    Near Bendigo, Victoria, AUS
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    66
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    2,559

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    Quote Originally Posted by RustyArc View Post
    Finally had the chance to give this a try - my little BOC Smootharc 130 set to maximum noise (140A) running a 3.2mm 7018 (I don't have any firesticks). DMM measuring Volts, clamp meter measuring Amps.

    At idle, OCV is 16V. Attempts at striking an arc saw the OCV rise to about 75V before averaging around 20V and 135A during welding. Once the arc was broken, the OCV rose to 75V for about a second before dropping to 16V.

    I've got 2 other welders to try out - just need a bit more messing around to set them up for measuring.
    Whoa! That puts a whole new spin on the issue! Very interesting.
    So the better welders are clever enough to keep open circuit voltage 'safe' but accommodate the high OCV needed for the relevant electrodes. I haven;t had a chance to measure that on mine yet, but I will. I know the portable my SIL has definitely does not do that.
    @ BobL, I'll post your test electrodes this week.
    Cheers, Joe
    again completely retired - more time to contemplate projects and spend more shed time....

  5. #65
    Join Date
    Jan 2015
    Location
    Sydney
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    214

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    I havnt read the whole post so it may of already been said.
    The low ocv is a pain to strike an arc, voltage it what gives electricity the "punch" which is why its safer to have an ocv of 7volts or so (my miller ocv is 7v)
    Ive seen some welders have a "hot start" from what i understand this increases the amps on start up to try offset the lower voltage on start up.

    Sent from my SM-G935F using Tapatalk

  6. #66
    Join Date
    Jun 2010
    Location
    Canberra
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    More testing:

    UniMIG 165 MIG/Stick combo machine. 3.2mm 7018 as before, dial set to run at 135A.

    OCV is a good, honest 53V. None of that VRD crap. Running a bead saw the voltage range similar to the BOC Smootharc 130, but a much more regulated amperage - once the bead was running, the amps only varied by 0.1 or 0.2 of an amp, whereas the Smootharc varied through a 10 A range.

    UniMig Razor Digital 200amp AC/DC TIG/Stick

    OCV 7 volts. As the arc is struck or released, could see the voltage shoot up to around 60V but very briefly - nowhere near as long with the BOC Smootharc. With the "arc force" set to max, the amps did move a little during running a bead, with arc force set to zero the amps were very tightly regulated to 0.1A

    If I ever get my hands on some 6010 or 6011 rods, I'd be curious to see how they behave on the different machines.

  7. #67
    BobL is online now Member: Blue and white apron brigade
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    Token Tools Alupulse 210 pro. 3.2mm 6013 rods

    DC MMA (meter on DC)


    AC MMA (meter on AC , DC V on meter is as same OCV as for DC setting above )

  8. #68
    BobL is online now Member: Blue and white apron brigade
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    Summary:
    OCDCV = 64 V for both all rods and both AC and DC currents

    By stepping frame by frame through the vids and entering the current data into Excel for about 20 points I get.
    +/- are 95% CI

    6013
    DC 23.0 +/- 1.0A
    AC 18.7 +/- 1.0A

    7016
    DC 29.6 +/- 1.3A
    AC 24.1 +/- 0.8A

    7018
    DC 23.7 +/- 1.3A
    AC 20.17 +/- 0.6A

    Here is a graph with the averages on the far right - some outliers have been removed from the data to determine average and

    Screen Shot 2018-02-25 at 12.05.57 pm.png

    The rod producing the most stuttering was the 7018 on AC (red line) despite this the current was perhaps the most stable of those tested.

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