Noob Gas Welding Problems
Tue, 31 Aug 2021 15:52:02 GMT
I've just started oxy/acet welding and am having problems I'm sure will be obvious to the experienced people here. Once I get a puddle started, it seems to fizz, spark, boils quite a lot. Based on videos I've seen, this shouldn't be happening. Also, more importantly, once the fizzing really gets going I get a loud backfire into the torch, which of course blows the puddle all over the place. I do think I have a neutral flame and have adjusted it to where I'm sure it's carburizing so I don't understand the fizzing / sparking in the puddle. It should be oxygen starved right? Any ideas (especially regarding the backfire)? Thanks in advance.
Reply:First things first, before you get pounced on by the cranky pro welders I will save you. They always want to know specifics because there's so many variables.Second things first, you want a NEUTRAL flame, NOT a carburizing flame. They are very different. the former has an equal chemical balance of fuel and oxygen, the latter has excess fuel and is not normally used except for example in situations where you want to add carbon to the metal for some reason. Given this important fundamental misunderstanding, have you taken any classes or been instructed?Back to first things first, and always include this info in your questions, and anything else you can think of like what you ate for breakfast and what breed of dog you have:What type of metal, what thickness and shape (channel, angle, etc.) and size.What tip size are you running, and what pressures (pressures measured with gas flowing).What position is the metal in (flat, vertical, overhead). If flat, is it elevated above the table so air can flow around it.How are you making your puddle - is the cone touching the metal, how far away, angle, etc.Are you using filler rod, and what kind.Is the metal clean, with oxides removed, painted, etc.Are you running flash arrestors and/or check valves?Issues that come to my mind: 1. you don't have a neutral flame.2. contaminated metal3. way too hot (the backfire into the torch is a good sign and potentially dangerous if you get a flash back).Provide a lot of details and 10:1 it will get diagnosed pretty quick. Don't and you'll get cranky replies.Hope this helps.
Reply:not sure to be able help you on this one, maybe try to clean your torch, i never had a problem like this, but i came here to ask you if you have a set of flashback arrestor on your torch! i heard too much of bad story. Attached ImagesCalculator > Bevel Square
Reply:2 things you said. The metal fizzles. And you are popping.My guess is you could go to a bigger tip for one thing.Popping and sizzling could be an indication that you are bringing the flame into an oxidizing state. I hope you lite the acetylene first, then slowly add oxygen to see the 3 parts of the flame. The inner cone, bright blue. The feather, light blue. The outer flame, orange.The middle light blue feather is the carburizing part of the flame. You want to shrink it to almost nothing, then a tad more to neutralize between carburizing and oxidizing. Lot's of beginners take it into the oxidizing state without knowing it and you get the sizzling. There is no visible indication other than the cone getting very bright. Practice taking the flame just out of carburizing.It is much better to be in a slightly carburizing state than slightly oxidizing.2 reasons a carburizing flame is used is for soldering a brazing, and the other is to deliberately add carbon to the surface of steel for hardening purposes. So carburizing is good sometimes. Oxidizing never is.Popping is an indication of too much oxygen and burning within the tip. Thus try a bigger tip.Last edited by shovelon; 05-05-2012 at 11:12 AM.Reason: crankyWeld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:Originally Posted by shovelon2 things you said. The metal fizzles. And you are popping.My guess is you could go to a bigger tip for one thing.Popping and sizzling could be an indication that you are bringing the flame into an oxidizing state. I hope you lite the acetylene first, then slowly add oxygen to see the 3 parts of the flame. The inner cone, bright blue. The feather, light blue. The outer flame, orange.The middle light blue feather is the carburizing part of the flame. You want to shrink it to almost nothing, then a tad more to neutralize between carburizing and oxidizing. Lot's of beginners take it into the oxidizing state without knowing it and you get the sizzling. There is no visible indication other than the cone getting very bright. Practice taking the flame just out of carburizing.It is much better to be in a slightly carburizing state than slightly oxidizing.2 reasons a carburizing flame is used is for soldering a brazing, and the other is to deliberately add carbon to the surface of steel for hardening purposes. So carburizing is good sometimes. Oxidizing never is.Popping is an indication of too much oxygen and burning within the tip. Thus try a bigger tip.
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