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Basic welding repair question (hey T!)

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Wade

02-18-2001 13:15:43




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I need to repair a broken grader blade. The cutting edge is broken. I have a replacement edge, but I'm not sure if it fits. I'm planning on a butt weld of the crack and then a patch of mild steel. Yall got any recommendations? I have a crackerbox and a small wire feed, but no shielding gas. I use flux wire and it doesn't feed worth a hoot. Methinks I'll stick it.




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lleger@altavista.net

02-19-2001 20:01:46




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 Re: basic welding repair question (hey T!) in reply to Wade, 02-18-2001 13:15:43  
Get ready for a surprise ! You are now going to try to weld hig carbon steel- pre heat and use low hydrogen rod.



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T_Bone

02-18-2001 14:24:38




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 Re: basic welding repair question (hey T!) in reply to Wade, 02-18-2001 13:15:43  
Hi Wade, grader blades are bolted on are they not? I'm sure I would bolt it and not weld it on so it can be changed. To make the repair, weld with stick, make sure the weld joint is clean 1" either side and v-notch, heat with a torch to burn off any oils and at the same time stress releive the crack by heating to 1100f then let cool slowley, then weld with a 70 or 80k psi rod. If you choose to weld the blade on, tack every 3" alternating sides, then skip weld every 6" on center for 2" long weld. The fillet weld "leg" shall be the thickness of the thinest member.

Nothing really special.

T_Bone

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Wade

02-18-2001 18:01:34




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 Re: Re: basic welding repair question (hey T!) in reply to T_Bone, 02-18-2001 14:24:38  
Thanks T. I know it's nothing special, but after seeing so many good ole boy welding jobs (aka chicken sh*t welding) I don't mind help in making mine look good and last. I know that the prep work is an important step, but people look at me funny while I'm grinding and buffing and pre cleaning a joint. This is a vertical break. It's not over 5 inches or so. I may start on it tomorrow. Look for more questions. I got my official learning in crackerboxes in Ag class about 20 years ago.

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ahmed khames

08-24-2002 02:33:12




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 Re: Re: Re: basic welding repair question (hey T!) in reply to Wade, 02-18-2001 18:01:34  
we have cracked body .the body have tube inside . the crack from top to the middle of the body.please tell me how to repair it.
thanks &besr regards
ahmed k\hames



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T_Bone

02-19-2001 06:49:54




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 Re: Re: Re: basic welding repair question (hey T!) in reply to Wade, 02-18-2001 18:01:34  
Hi Wade, You too huh :), Nothing special was ment to say no special technique. Alot of people skip the cleaning part and wonder why a weld cracks or the metal won't weld correct.

T_Bone



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Al English

02-19-2001 08:49:28




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 Re: Re: Re: Re: basic welding repair question (hey T!) in reply to T_Bone, 02-19-2001 06:49:54  
A friend of mine puts up steel for commercial buildings. He told me they don't clean anything, and weld right throught he rust, paint marks, and anything else that gets in the way. Aparently things are over-designed enough to get away with this...Al English



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T_Bone

02-19-2001 19:57:30




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 Re: Re: Re: Re: Re: basic welding repair question (hey T!) in reply to Al English, 02-19-2001 08:49:28  
Hi Al, Yep been there done that but thats a different type of job. There speed is the money maker and 6010 burns alot of paint and rust away but it's still not 100% weld. We usually over weld to compensate for the poor welding conditions but if one would try and clean a joint before welding he would be kicking his lucnh box down the road before noon!

We also weld steel decking & roofing down without precleaning or drilling holes but there again we over weld. If cleaned and a hole drilled a 1/4" weld would do, with out then 1/2" spot weld is usual. Is this an approved method? you bet as it's been done for the past 75yrs that way and without problems.

For a bucket weld like Wade is talking about, then preclean cause if you don't it'll just crack back out again. It's the application I'm talking about that determines how and what to do.

T_Bone

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