low viscosity plastic steel type stuff for cosmetic repair by filling porosity in cast iron.

[Tmoose]

2 inch bore with ± 0.001" tolerance. Possibly already finished to size. The porosity is significant enough We'd like to make a cosmetic repair.

I envision regular filled epoxies may be a littl thick to stuff into small holes.

Does anyone have experience with products that are very flow-able?

thanks
Dan T

 

[ornerynorsk]

I've used JB Weld on porosity in gray iron castings with great success. If applied carefully enough, a little emery cloth is all that is required to knock the high spots down. If the final machining is not yet performed, it machines well and stays in place as long as the parent metal was reasonably clean to begin with.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[MintJulep]

Loctite has a few products intended for this. One may be exactly what you need.

http://www.henkelna.com/industrial/...cation=00000002GL|action=search|mode=faceted|

 

[MikeHalloran]

Before epoxies arrived, one common filler was lead/tin solder.


Mike Halloran
Pembroke Pines, FL, USA

 

[ScottyUK]

My mechanical colleagues with a former employer achieved some good results with Devcon's Plastic Steel liquid. It certainly looked like it had low viscosity for a resin. Requires care with surface prep if I remember correctly - maybe a solvent cleaner or primer?

 

[Tmoose]

thanks all
Dan T

 

[arunmrao]

3M has a product, which sets well and then can be machined too. Color matching is very important, whenever such coverup is planned.


"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

 

[Artisi]

Vacuum impregnation with the appropriate epoxy is the way to go. Who / where etc up to you to locate.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[tbuelna]

One problem with using epoxy compounds to fill small metal surface defects is removing any trace of surface contamination in the defects. If the surface the epoxy compound is being applied to is not thoroughly cleaned, the epoxy will not adhere. When the metal surface is machined all sorts of debris/contaminants are forced into these small surface defects and some metal is usually smeared over the opening. The only process that works well, removing both the smeared metal and trapped contaminants, is chemical etching.