Zaps welding class part 4

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This is Zap wielding the Hot roll & Taper lockThis is the piece almost completedThis is completeMore see Zaps class part 5Drivesector Hobart Handler 140Hobart Handler 180Ready Welder 2Hobart Air Force 400Airco Stinger 225Of all the things I've lost, I miss my mind the most."OZZY"
Reply:Hey zap...today I was trying to weld some a53 grade B steel. I was Tiggin it and had lots of porosity in all the welds...dunno what was going on....Had to grind everything and do it with MIG...Whats going on??....I was using 2.4 mm green tungsten...130 amps...1/8 filler ER-70S wire....100% argon at about 20 CFH....surface was ground with the sand paper discs...(dunno the correct name)...I even heated the surface with oxy-acetilene to burn anything (if it had something) over it....Also tried cleaning it with alcohol after grinding and still porosity when welding....Any idea?My Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:was it pipe? did you clean the inside to? (yes i was paying attention in class today lol)how was your shielding coverage?have any pics?
Reply:i did a search on A-53 grade b steel..came up blank..the "a" before the # on steel usually means its a air hardening alloy..can you post a pic??...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:MM....That´s the type of steel that is used on the seamless, pipes in here. They´re 3/4 ID, 1.05" OD with .154 wall......in other words....3/4 pipe SCH80 SUre...Here´s the pics! Attached ImagesMy Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:Another one Attached ImagesMy Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:last one Attached ImagesMy Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:"A53" is the ASTM (American Society For Testing and Materials) designation for black and hot-dipped galvanized line pipe in either seamless or welded form. "B" is the designation for minimum tensile strength in p.s.i.   Grade "A" would be 48,000   Grade "B" is 60,000Why were you using pure (Green) Tungsten and not 2% (Red)?If you were trying to weld joints like the ones in the pics, then you didn't have them clean enough. If you have a coped tube on top of another tube you have to clean both of them. Especially pipe...that stuff is nasty!! ...and Elvergon, why are you using pipe for a roll cage??http://all-a-cart.comWelding Cart Kits and accessories
Reply:wow..i have to hang around with you more often paul.. ..zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Originally Posted by elvergonHey zap...today I was trying to weld some a53 grade B steel. I was Tiggin it and had lots of porosity in all the welds...dunno what was going on....Had to grind everything and do it with MIG...Whats going on??....I was using 2.4 mm green tungsten...130 amps...1/8 filler ER-70S wire....100% argon at about 20 CFH....surface was ground with the sand paper discs...(dunno the correct name)...I even heated the surface with oxy-acetilene to burn anything (if it had something) over it....Also tried cleaning it with alcohol after grinding and still porosity when welding....Any idea?
Reply:Ha ha ha...Anytime ...zap!We just have to work on that teleporter so it's not such a drive!! First round of Heineken's are on me. - Paulhttp://all-a-cart.comWelding Cart Kits and accessories
Reply:Originally Posted by ZTFab"A53" is the ASTM (American Society For Testing and Materials) designation for black and hot-dipped galvanized line pipe in either seamless or welded form. "B" is the designation for minimum tensile strength in p.s.i.   Grade "A" would be 48,000   Grade "B" is 60,000Why were you using pure (Green) Tungsten and not 2% (Red)?If you were trying to weld joints like the ones in the pics, then you didn't have them clean enough. If you have a coped tube on top of another tube you have to clean both of them. Especially pipe...that stuff is nasty!! ...and Elvergon, why are you using pipe for a roll cage??
Reply:Elvergon...I was looking at one of your pics a little closer and had another ?How are you deburring the tube after you cope it? I circled the part of the pic I am talking about. It seems that you still have a burr from coping which can contain contaminents. Attached Imageshttp://all-a-cart.comWelding Cart Kits and accessories
Reply:Definitely looks like cleaning could be the problem. I see oxidized metal in the pic. Clean the ID of pipe at least a half inch in from the weld zone. Grind the OD shiney and use a high speed carbide burring bit for the ID. Don't use a flapper wheel for the ID. Clean the OD of the other pipe. Stay with the 2% thoriated tungsten. Are you using pure argon or did you hook up to your 75/25 ArCo2 bottle for the MIG by accident? Just a thought.Good luck!Tennessee Squire Association
Reply:I was going to guess the pure tungsten had something to do with it, and the cleanliness of the inside of the pipe would do it, and my only other thought is how about the gas hose? If there is a leak, it could suck in air and cause porosity especially in a carbon weld. I know from seeing it happen a few times. I wouldn't rule out the contaminated pipe either. I've seen two pieces of pipe butted up and TIGed with porosity on one side and fine on the other. All pipe is not created equal. Just my .02, Henry
Reply:Just browsing, noticed this thread made a jump to a TIG porosity problemhttp://www.weldingweb.com/vbb/showthread.php?t=6797So this is a new thread on that issue.First, why would the type of tungsten, pure/thoriated/lanthanated/ceriated, affect porosity?  In my opinion it would not.Not unless you've contaminated it, or melted it into a big enough blob to create turbulence in the shield gas flow.The tungsten supplies the flow of electrons in the arc.  The alloying affects it's melting temperature and ease of arc starting.  The size and grind of the tungsten can affect the energy distribution density and thus the size of the pool.  See link for good info on tungsten types.http://www.diamondground.com/index.htmlNext, others made valid points: remove rust/scale, check for gas leaks, check for pure argon not mig mix, contaminants (oil) from cutting, cheap foreign pipe (impurities in steel), and of course the filler metal alloy.You might also consider:  excess gas flow or other sources of turbulence, drafts or fans that disrupt shielding, change to a gas lens, and too long of an arc length, too long of a tungsten stickout.Opps, intended to make a new thread out of this.
Reply:Originally Posted by ZTFabElvergon...I was looking at one of your pics a little closer and had another ?How are you deburring the tube after you cope it? I circled the part of the pic I am talking about. It seems that you still have a burr from coping which can contain contaminents.