Skip to main content

[MW:8250] Re: Repairs to the Aluminium Cylinderhead of a Vintage Car

By Materials & Welding
Dear sir,
There are two methods possible for repairing the head 01)by spray
metalizing in case of ARC /flame spray of the metal the base metal
temp DOES NOT go above 100-120dig C ( max)
In fact the base metal is only cleaned mechanicaly and not heat in put
is given to it You can built up up to 100microns to 1 to 2 mm ( ned to
check the techno -economics ) which can be further machined to the
desired size.
Other solution is very much conventional and can be used only to seals
holes i.e. soldering the face
The solders are available in paste ( preferably for furnace
applications as were used in car ac and other pipe soldering) as well
as rod form specially for repairs and on hand applications
but in this case you need apply heat to the job and if the heat added
is more than required (175 to 180 digC) then the solder is not proper
or higher amount of heat may open the other holes also.
regards

S.B. Badami
RMS Engineering
11/1 Shanti Nagar Bhosari
cell no +919850920429
+912027127939
visit us at www.indiamart.com/rmsengineering/

On Nov 11, 10:07 am, donboscomar...@vsnl.net wrote:
> November 11, 2010
>
> Dear Friends,
>
> The attached is a report of the repairs carried out on a Vintage Car's Engine's cylinderhead and the continuing problems of the same. The material is cast Aluminium and being a vintage car, replacements are not available. Cutting the present cylinderhead for making moulds for casting not acceptable to owner due to the risk of losing the cylinderhead for good ! We have described the problem and seek advice about Probable Solutions.
> Thanks in advance & B. Rgds.  
> G. A. Soman
> Principal
>
>  Rolls Royce - 1.doc
> 50KViewDownload

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more