Hi to All!
Any one could explain to me what is the used of buttering, why it is required?
I would highly appreciate any reply on my query.
Thanks to all!!
Ritz,
"Buttering" is a term used for adding weld metal to build a part up. if you machine a cast part and there is not enough cast to allow for machine cleanup you would "butter it up" to get complete cleanup, another example would be if you needed a 12" plate and the plate you had was 11-3/4" you could butter up the end to bring it to 12"( and depending on what standard you are working to, you need to have an engineers approval if you add a certain amount of filler metal)
I'm sure others will give you more feedback, but that should explain it!
Ritz,
Buttering is when you are trying to join two materials that may not be compatible you deposit a layer of weld on one or both surfaces that then enables a metallurgically compatible weld to be performed.
My memory is a bit hazy but years ago we had to weld some 316 sockets onto a CA6NM (cast stainless) pump body. You couldn't weld 316 directly onto the CA6NM so we buttered the CA6NM with 410 first, stress relieved it and then welded the 316 onto the 410 successfully.
Hope that helps,
Regards,
Shane
Right Shane.
But why u preferred 410 weld butteing? Why not 309 which is nearby 316 tham 410.?
The buttering was on the cast material - not the 316.
We needed to add a filler metal to the CA-6NM to make it "weldable" to the 316.
In addition to the definitions ctacker gave sometimes it refers to building up a layer of a compatible filler rod so the part can be joined to a different material, or putting a layer on each side so a cheaper filler can be used to fill the majority of the joint.
To Shane and Dave,
I would like thank both of you for your technical explanations and now I have a clear idea about buttering.
Regards,
Ritz,
Haven't had to do that in so long, I forgot about that, good answer!
Buttering can also be used for the following:
Metal A is to be welded to Metal B. Metal A requires PWHT, but properties of Metal B would be seriously affected by PWHT.
Metal A is buttered, with 1/2-3/4" butter layer, and then subjected to PWHT.
Bevel is machined on Metal A butter layer and then Metal B is welded to it and no PWHT is required.
This technique is effective for welding high strength forgings (like F22) to API 5L line pipe (X65, X70, etc.), as an example. In this case the butter layer is still a low alloy carbon steel, but the consumable to be used is selected so that its properties won't be affected by the PWHT and PWHT will not be required after joining the line pipe, to get acceptable hardness, when required for sour service.
...likewise buttering can be used when it is desired to lower the preheat on a particular joint, or when it may be impractical to maintain a high preheat on a particular joint. I see this most often on mining equipment. Without buttering, the material may require a 400° preheat. If the individual pieces are buttered in the shop, the preheat is lowered to that of the buttered layer when the joint is welded in the field.
~thirdeye~
When I am preparing my olatha sweet corn, I like to eat it after a proper amount of steaming. I also like a moderate amount of salt and pepper.
That is all.
AWS D1.1:2015 gives some guidance when the root opening is too wide and allows buttering of the root faces until the joint is in compliance, so I would think you could use this same idea to repair the length. See clause 5.21.4.2...you are allowed twice the thickness of the thinner part or 3/4", whichever is less
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