fuse welding

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i was told that you cannot fuse weld carbon steel. is this true?
Reply:By fuse weld, do you mean weld two pieces of steel together without adding any external filler metal?If so, then your source is incorrect.  You can weld steel using TIG or oxy-fuel without adding any filler metal.Please explain fuse weld if I've misunderstood...Benson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:Fusion welding, either with oxy / fuel or GTAW (TIG), is feasible on thin sections up to 3.0mm, (1/8") in both fillet and square butt configurations. You need to ensure all oxide is removed and the joints are close fitting.GTAW gives superior results due to the more concentrated weld pool. Expect a little porosity with oxy / fuel methods until you become adept. Carbon steels do not contain enough deoxidants to reduce porosity, the filler contains silicon etc to assist. Prices of common LW1 filler are cheap, so it pays to use filler for improved results.Cheers
Reply:What is ERW classified as?
Reply:Originally Posted by chrispc66Fusion welding, either with oxy / fuel or GTAW (TIG), is feasible on thin sections up to 3.0mm, (1/8") in both fillet and square butt configurations. You need to ensure all oxide is removed and the joints are close fitting.GTAW gives superior results due to the more concentrated weld pool. Expect a little porosity with oxy / fuel methods until you become adept. Carbon steels do not contain enough deoxidants to reduce porosity, the filler contains silicon etc to assist. Prices of common LW1 filler are cheap, so it pays to use filler for improved results.Cheers
Reply:mill scale or oxidation"Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful." -- Seneca the Younger
Reply:Porosity??? from what??
Reply:Thank you old iron, typically carbon steel fillers contain deoxidants to tie up oxygen / nitrogen and reduce porosity, steels contain little deoxidant as these elements are already tied up as oxides during manufacture.Answer you question makoman 1860 ??By the way, ERW is "electric resistance welded", a method of welding the longitudinal seams during pipe manufacture. Other methods include SMLS (seamless ), HFW, PAW, SAW.CheersLast edited by chrispc66; 02-10-2009 at 05:17 AM.Reason: added data
Reply:Originally Posted by chrispc66Thank you old iron, typically carbon steel fillers contain deoxidants to tie up oxygen / nitrogen and reduce porosity, steels contain little deoxidant as these elements are already tied up as oxides during manufacture.Answer you question makoman 1860 ??By the way, ERW is "electric resistance welded", a method of welding the longitudinal seams during pipe manufacture. Other methods include SMLS (seamless ), HFW, PAW, SAW.Cheers
Reply:AWS: A5.2 - R45 or RG-45 as it is sometimes called, contains manganese which is a useful deoxidiser / sulphide former. As deoxidisation becomes more important as in AWS A5.18 fillers, Si, Ti and Al are used to increase the effects, and tie up other undesireables. In the absence of these elements, manganese will form oxides....therefore reduce, but not fully eliminate the incidence of porosity during OFW.For improved results, simply use 1.6mm R4, R6 or if you have the cash, R2 (triple deoxidised)Cheers
Reply:Originally Posted by chrispc66AWS: A5.2 - R45 or RG-45 as it is sometimes called, contains manganese which is a useful deoxidiser / sulphide former. As deoxidisation becomes more important as in AWS A5.18 fillers, Si, Ti and Al are used to increase the effects, and tie up other undesireables. In the absence of these elements, manganese will form oxides....therefore reduce, but not fully eliminate the incidence of porosity during OFW.For improved results, simply use 1.6mm R4, R6 or if you have the cash, R2 (triple deoxidised)Cheers
Reply:Originally Posted by makoman1860R45 and RG-45 have different chemical compositions. I know this when we got into an issue where the filler metal supplier sent us R45 instead of RG-45. The weld pool acted like we were using ER fillers. A quick scan showed the added constituents in the R45. A call to Esab verified this and the R45 was returned.
Reply:Actually the OP mentioned "carbon steel".  Nothing was said whether it's low carbon, mid range stuff, or high carbon.The answer to all grades is YES it can be fusion welded, either by welding it to itself, or, adding an outside filler metal to 'fuse" the pieces together.  Just my two cents worth.
Reply:Sure, and they can also be forge welded. No filler necessary......City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:NP Makoman,However both these fillers use Mn as deoxidant where Si, Ti or Al are not added. Welding with pure  iron would result in massive porosity problems.... JMOCheers
Reply:Have you ever tried Fuse wire? It can literally be used to fuse anything.  I just found out about it, and recommended most anyone welding.  http://on.fb.me/wOYrqK << You're welcome
Reply:Autogenous welding.