mugen header quality
For thost that installed the mugen header themselves, did you notice some pitting on the inside of the 4 pipes where they are welded to the aluminum plate that attaches to the engine?
I just received my header yesterday and was taking a look at it and noticed some putting inside where they are welded. Should I worry about it? |
The Mugen header is all stainless steel so when it is welded
from the pipes to the flange the weld will get somewhat on the inside of the tube. Mugen solution to this is to hand grind the inside of the flange and pipe to smooth out the exhaust gases leaving the engine. some small pitting in the weld area is inevitable and will not effect the header life or integrity at all. Mugen is one of the only manufactures to do this hand clean up and it is the mark of a top manufacture. John and i talked about this today and i, examined 4 headers from mugen to verify this. 2 of the original production run and 2 brand new headers that arrived this week. All had the same high quality grinding and smoothing done. Hope this helps. Any questions please feel free to call us at King Motorsports. 262-593-2800. Regards Bob Clark |
Thanks Bob!
I have been very impressed with both Mugen quality on their parts and on King Motorsports customer service. They are a great company to work with |
The pitting in the area noted can come from one of two things.
1) The weld bead hung on the inside of the tube did not "clean up" all the way. 2) The parent materials were not completely cleaned thereby introducing porosity into the weldment. Most SS exhaust headers are made of 304L SS. This steel is easily formed and has outstanding corrosion resistance properties. It is a high chromium, low carbon (L) austinitic steel. It is very forgiving. In case #1 above the bead in the flow path is ground flush with the tube. Any pits are below the parent material and therefore "out of the flow". In case #2 the pores are caused by inclusions in the weld, known as weld slag. It takes a bunch to cause any damage. In the NDT (nondestructive test world) we measure the number of pores, their size, and center distances to grade, or classify, the weld. Class "A" is X-Ray Grade, "B" die penetrant, and "C" visual inspection. Unless you see a ring of large pits more then 90 degrees around your header it will last you a very, very, long time;). Utah Formerly ASTM (American Society of Testing Materials) Level III Certified Inspector of Weldments. P.S. My father was one of the inventors of Electron Beam Welding....the weld of all welds:). |
Utah,
Great info on how thus all works! The minor pitting on the headers in question are in the weld area and are very minor in scope.I think this comes about from the gauge of the pipe (Generaly thinner than the flange it is welded to) VS the thickness of the flange. I, think your case#2 presents this perfectly. Very minor pitting inside a tube on the weld. Regards Bob@King Motorsports |
Thanks for the informative post Utah!!
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Originally posted by Utah S2K ...Utah Formerly ASTM (American Society of Testing Materials) Level III Certified Inspector of Weldments. P.S. My father was one of the inventors of Electron Beam Welding....the weld of all welds:). |
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