Z20let Corsa
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| posted on 11/12/08 at 05:45 PM |
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1 last welding question
right im nearly there. been doing a bit of practice and im pretty happy with the results. there are actually 2 questions. what do i need to alter to
get the weld to penetrate into the metal im welding more? and also my welds seem to have little air bubbles in them. i thought this was lack of gas at
1st but its definately turned up enough, how do i tell how much gas is in the bottle?? thanks.
locost +4 v8 in progress.
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dogwood
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| posted on 11/12/08 at 05:55 PM |
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What welder are you using?
Usually more power means better penetration.
Holes in your welding could be contaminants, rust/ grease etc
Don't think there is any way of telling how much gas is left unless you have a regy gauge
HTH
FREE THE ROADSTER ONE…!!
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blakep82
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| posted on 11/12/08 at 06:17 PM |
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more power for more penetration, but you may need to turn the wire speed down a bit too
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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maartenromijn
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| posted on 11/12/08 at 06:22 PM |
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As above. And, as far as I know, but when you weld 'pushing', it will penetrate better then 'trailing' (I don't know the
correct English terms). If you are not sure about the quality, cut open a few welds to check the penetration.
I thought it is standard to have a pressure gauge for the bottle, and a flow gauge. I always use 10 litres/min and the result is fine.
In the picture you can see the twin gauge gas set on the gas bottle. Sorry for this bad pic, but this is all I have athe moment.
 
Rescued attachment 24-08-03 0002.jpg
BLOG: http://thunderroad-super7.blogspot.com/
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gjs
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| posted on 11/12/08 at 06:42 PM |
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if the gas bottle is a full size it should have 2500-3000 psi on gauge,a flow meter is better as mentioned,also check no draughts blowing,wind etc,it
will blow the gas from the weld area.
you could slow down a bit when welding,its hard to tell unless i can see what you are doin.Welding is usually best when everything is constant,travel
speed arc length,gas pressure,cleanliness etc etc
[Edited on 11/12/08 by gjs]
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dogwood
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| posted on 11/12/08 at 06:44 PM |
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quote:
Originally posted by maartenromijn
I thought it is standard to have a pressure gauge for the bottle, and a flow gauge. I always use 10 litres/min and the result is fine.
In the picture you can see the twin gauge gas set on the gas bottle.quote:
Yes most welders do, but hobby welders only have a gas flow adjuster with no gauge.
So no way of telling how much gas is left.
[Edited on 11/12/08 by dogwood]
FREE THE ROADSTER ONE…!!
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maartenromijn
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| posted on 11/12/08 at 09:30 PM |
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quote:
Yes most welders do, but hobby welders only have a gas flow adjuster with no gauge
I'm using it for my hobby...
BLOG: http://thunderroad-super7.blogspot.com/
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thomas4age
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| posted on 13/12/08 at 02:51 PM |
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are you sure the gass reaches the end of the welding torch?
I worked a welder with a non detachable torch once, and there was a break in the gas line halfway down the torch flexi bit.
replaced it with a ESAB torch and socket, and the owner has never had problems since, results where the same, tiny pockets in weld seam.
Grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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Peteff
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| posted on 13/12/08 at 04:33 PM |
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If you're using co2 from a cylinder with a dip tube it could be freezing up at the moment 
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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jacko
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| posted on 13/12/08 at 06:11 PM |
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Are you pushing the torch or pulling it ?
you should push so the gas cleans and puts a shield around the weld your doing
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Mark Allanson
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| posted on 13/12/08 at 08:09 PM |
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quote:
Originally posted by jacko
Are you pushing the torch or pulling it ?
you should push so the gas cleans and puts a shield around the weld your doing
Pushing the torch technique only applies to long passes, almost all welds on a locost chassis are 1" long so you should be 90° to the weld in
all planes and as close as you can reasonably get.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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