Repair of cast iron
Speedy Builder5 | 01/07/2018 16:04:00 |
2878 forum posts 248 photos | The other day I dropped my rebate plane off the scaffolding whilst building a wooden garage. Of course, being of cast iron, something had to break and on recovery, the nose of the plane had snapped off. To repair it, I ground a 'V' along the crack line and welded it back on with Stainless filler wire using an Argon CO2 gas mix and the MIG welder. When it had cooled a little, I put a spot more weld on the back of the crack - a bit difficult to get to though ! |
Jon Lawes | 01/07/2018 16:39:34 |
![]() 1078 forum posts | Thats the difference between an engineer and the layman! Someone else would have just bought another.... |
Clive Foster | 01/07/2018 18:59:36 |
3630 forum posts 128 photos | Interesting that you used stainless MIG wire for such good results. I've tried ordinary MIG filler with very poor results. Was told that the MIG heat is too concentrated so only a very small volume of the part being repaired gets really hot leading to very fast cool-down producing a hardened, brittle, joint line between substrate and filler. Presumably the poor thermal conductivity of stainless slows the cooling process enough for the joint line not to go really hard. Generally the stick welder buttering process where the joint is opened up to a relatively large Vee and filler initially built up from several thin layers made at lowest practical current before finishing with a normal size rod effectively welding filler to filler works well enough for me. But there are times when MIG wire in a smaller Vee would be a better fit. Clive. |
fizzy | 01/07/2018 19:02:54 |
![]() 1860 forum posts 121 photos | Might it be cast steel and not iron, it welds OK?
|
Speedy Builder5 | 01/07/2018 19:20:39 |
2878 forum posts 248 photos | Interesting point Fizzy, it files like C.I. How would you tell C.I from C.S. ? |
Clive Foster | 01/07/2018 20:55:46 |
3630 forum posts 128 photos | If it files like cast iron it could well be what our American friends call "semi-steel". Basically a grey cast iron with a fair bit of steel added to the melt. Maybe 30 to 40% steel. SouthBend used around 40% steel in their mix. I've repaired a couple or three SouthBend components and it welds very nicely indeed. Lots of ordinary steels are worse. Best one was a broken gearbox end clamp eye on the banjo bracket off a Heavy 10 which went back together absolutely perfectly. Under a thou out of round with just the right amount of nip for adjustment when loose and needing minimal tightening on the bolt to make it stay. As I understand it semi-steel in UK terminology refers to materials produced by specialised processing of ordinary cast iron, eg. nodular cast iron, rather than simply mixing in steel to the melt before pouring. Clive. |
Speedy Builder5 | 01/07/2018 21:40:44 |
2878 forum posts 248 photos | It is an American plane ! I thought Cast Steel had bright flakes in it when you observe the broken face. |
vintagengineer | 01/07/2018 21:58:40 |
![]() 469 forum posts 6 photos | Might be mallable iron. |
peak4 | 01/07/2018 22:23:34 |
![]() 2207 forum posts 210 photos | A good friend of mine, a competent welder, but now sadly deceased, also used stainless on cast iron. He normally used stainless to lay down/butter the first coat and finished off with plain steel; seemed to work well enough, even on car exhaust manifolds.
Bill |
Nick Hulme | 03/07/2018 16:55:05 |
750 forum posts 37 photos | I use 316L wire and rods on Cast Iron, always with plenty of pre-heat and a well insulated slow cool, it works very well. |
Brian Wood | 03/07/2018 18:46:22 |
2742 forum posts 39 photos | I only have oxy-acetylene gas welding and have had success with Sifbronze brazing rods and the matching flux to repair breaks in cast iron. Preheating and slow cooling is important Brian |
Speedy Builder5 | 29/11/2021 21:09:00 |
2878 forum posts 248 photos | Update, just been watching the YESTERDAY channel where they were repairing large decorative cast iron panels on a bridge in Edinburough. The panels were removed then the temperature of the panel raised overnight to 600 deg C before oxygen acetylene welding. Bob |
Martin Kyte | 29/11/2021 21:33:24 |
![]() 3445 forum posts 62 photos | If that is a Stanley No 78 then there are some interesting comments here. Including the expectation of Brazed repairs exactly where yours broke. regards Martin |
Martin King 2 | 29/11/2021 22:56:57 |
![]() 1129 forum posts 1 photos | Hi All, I have seen and had no end of these broken No:78's, usually for spares. I have never had any luck trying to weld them but now that I have my TIG unit I may have a go for fun. Not worth selling a repaired one though. I am just listing a nice complete boxed Woden version the last of three that I bought at a flea market. They used to do very well but not so good these days. Lots of people sell them on EBay when cut down as "Chisel Planes" and the suckers seem to like them! Cheers,Martin |
Martin King 2 | 29/11/2021 23:01:04 |
![]() 1129 forum posts 1 photos | Martin Kyte, Just noticed that your link is to Patrick Leach's Blood & Gore site; THE definitive Stanley plane resource on the net. Patrick is a good friend and a great buyer and seller of rare and quality tools with a wealth of knowledge. Cheers, Martin |
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
Sign up to our newsletter and get a free digital issue.
You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.