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Lightening darkened steel

chrisser All Messages By This Member #118428 This is peripheral to lathes I guess, hope it's OK to ask.? Have a couple of items from another lathe that I'm cleaning up and repurposing for my 7x. I'm guessing you all have seen older bare metal steel tools.? They get darker over time with use if not protected.? I'm guessing some of it is oil, some is dirt and other contaminates, and some is probably a chemical reaction, possibly rust or rust-related. I know you can brighten most things up by abrasion - sanding/polishing/etc but that removes at least some of the metal. Are there any chemical treatments that can brighten steel that has darkened over time, or is it a permanent change in the metal?
davesmith1800 All Messages By This Member #118429 In plating they use acid.?? Dave?
Bruce J All Messages By This Member #118431 开云体育 That’s not necessarily something you want to remove.? If it’s not rust, it’s likely oil, bluing (which doesn’t have to be blue) or some other rust preventative, some might be the finish left by case hardening, or some combination.? If it’s rust, use something like Evaporust, but be prepared to treat it with something ?immediately after de-rusting it. I’d simply clean them with a de-greaser if it’s just gunk accumulation, followed by an oil application. Basically you don’t want to rush in to produce a shiny finish in case you destroy the protective layer you’re mistaking for rust. Also if it’s just old and darker but that isn’t affcting the use…why worry about it? On Jan 18, 2024, at 9:26 AM, chrisser via <chris.kucia@...> wrote: This is peripheral to lathes I guess, hope it's OK to ask.? Have a couple of items from another lathe that I'm cleaning up and repurposing for my 7x. I'm guessing you all have seen older bare metal steel tools.? They get darker over time with use if not protected.? I'm guessing some of it is oil, some is dirt and other contaminates, and some is probably a chemical reaction, possibly rust or rust-related. I know you can brighten most things up by abrasion - sanding/polishing/etc but that removes at least some of the metal. Are there any chemical treatments that can brighten steel that has darkened over time, or is it a permanent change in the metal? --? Bruce Johnson "Wherever you go, there you are." B. Banzai, PhD
davesmith1800 All Messages By This Member #118433 I have machine a lot of cast iron most a high quality class 45 . It has dill look just machining.? The Chinese cast iron has a brighter can not till you why. Dave?
Jacques Savard All Messages By This Member #118435 help if you know casting iron how can we weld it? ? I have an old tool, a type of miter saw for wood that is broken, the parts seem impossible to weld or repair with a screw Can cast iron be welded? jack 47 71
mike allen All Messages By This Member #118436 开云体育 ??? ??? YA need to use a nickel rod & pre heat but not too hot & go slow & let cool often is the way I was taught way way back . I've always bee luck enough to be around some real good wenders when I have needed CI welded . animal On 1/18/24 12:16 PM, Jacques Savard wrote: toggle quoted message Show quoted text help if you know casting iron how can we weld it? ? I have an old tool, a type of miter saw for wood that is broken, the parts seem impossible to weld or repair with a screw Can cast iron be welded? jack 47 71
Gordon All Messages By This Member #118437 开云体育 Look into brazing. Usually quite successful in bonding cast iron. Surface prep is the key for either welding or brazing. Gordon On Jan 18, 2024, at 12:16, Jacques Savard <jacquessavard@...> wrote: help if you know casting iron how can we weld it? ? I have an old tool, a type of miter saw for wood that is broken, the parts seem impossible to weld or repair with a screw Can cast iron be welded? jack 47 71 Gordon Taylor gptaylor98363@... Those that say a job?cannot be done should?not interrupt those that?are doing it.?―?George?Bernard Shaw
davesmith1800 All Messages By This Member #118438 I use both? I like brazing over using cast iron rod? But cast iron rod is closer match.? Dave? toggle quoted message Show quoted text Gordon 12:54pm? ? Look into brazing. Usually quite successful in bonding cast iron. Surface prep is the key for either welding or brazing.
[email protected] All Messages By This Member #118439 As a life long mechanic and also a shop owner, I never ever messed with welding or brazing cast iron. If it needed to be done I took it to a pro. Mickey moused work will always fail. If it's basically nothing of importance then fine, braze it. But dont expect such a job to take any stress. Also, if you try brazing it and you mess it up or it breaks and you take it to a pro to properly get repaired, you will get charged extra because now it takes more to clean things up to be able to properly repair it. My life long experiance. george On Thursday, January 18, 2024 at 12:20:43 PM PST, mike allen <animal@...> wrote: ??? ??? YA need to use a nickel rod & pre heat but not too hot & go slow & let cool often is the way I was taught way way back . I've always bee luck enough to be around some real good wenders when I have needed CI welded . animal On 1/18/24 12:16 PM, Jacques Savard wrote: help if you know casting iron how can we weld it? ? I have an old tool, a type of miter saw for wood that is broken, the parts seem impossible to weld or repair with a screw Can cast iron be welded? jack 47 71
Bruce J All Messages By This Member #118440 开云体育 This Old Tony has a video about this?? It’s not easy. In the past when I”ve had to repair a cast iron piece (treadle on an old sewing machine) I went with brazing which worked well, but your application may vary. On Jan 18, 2024, at 1:20 PM, mike allen <animal@...> wrote: ??? ??? YA need to use a nickel rod & pre heat but not too hot & go slow & let cool often is the way I was taught way way back . I've always bee luck enough to be around some real good wenders when I have needed CI welded . animal On 1/18/24 12:16 PM, Jacques Savard wrote: help if you know casting iron how can we weld it? ? I have an old tool, a type of miter saw for wood that is broken, the parts seem impossible to weld or repair with a screw Can cast iron be welded? jack 47 71 --? Bruce Johnson "Wherever you go, there you are." B. Banzai, PhD
davesmith1800 All Messages By This Member #118441 After I sold my business I work as Repair Machinist.? You see a lot of attempts at cast iron repair.? JB weld was one best to see , you had take time to remove all JB from casting. This same for bad welds and brazing.? Mainly it add hours to job.? This includes strip tap holes everthing they try fail.? That would include welding , brazing and plug {drill and tap for crank cases not thread inserts} and must be done right the first time. Dave?
Roy All Messages By This Member #118444 There are some Ni based rods that do a reasonable job of color matching cast iron. Success is helped with experience - find a welder who's done it repeatedly. Us mere mortals are more likely to be successful with brazing. All the caveats about slow temperature changes & doing small areas at a time still apply. Roy
davesmith1800 All Messages By This Member #118445 Roy 5:22pm? ? There are some Ni based rods that do a reasonable job of color matching cast iron. Success is helped with experience - find a welder who's done it repeatedly. Us mere mortals are more likely to be successful with brazing. All the caveats about slow temperature changes & doing small areas at a time still apply I found someone interested a color match is a real pain. It is surprising of different colors in cast iron.? I like brazing too it does great job and can done with almost sun glasses and a torch. I still have 100 pounds of rod for cast iron work.? Dave?

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