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Technical & Reference Section => Tech and Restoration => Topic started by: motomagII on October 01, 2010, 06:03 PM

Title: i need some metal
Post by: motomagII on October 01, 2010, 06:03 PM: i just got myself a frame and need some metal for a repair .it needs to be 4130 chromo plat plate not tube for bottom gusset a piece around 4 inch square will be good

i take it couple people here mioght know what i just won on ebay
Title: Re: i need some metal
Post by: YGT on October 01, 2010, 06:31 PM: Ask malo at pir-bmx.com ...... he imports 4130 for his handmade frames.
Title: Re: i need some metal
Post by: bof on October 01, 2010, 08:09 PM: Greg if its just a small piece of plate steel you are welding onto a frame I wouldnt worry about it being cromoly any steel would do . what thickness are you after I might be able to help with some plate steel :daumenhoch:
Title: Re: i need some metal
Post by: motomagII on October 01, 2010, 08:16 PM: 1.3 or 1.4mmthick and about 3 or 4 inch square .was just thinking rest is chromo so different metals when welding might have different weld/heat resistance temperatures?

cant wait for this to turn up from the usa get it welded and ready for the summer series .gonna ride it like i stole it lol
Title: Re: i need some metal
Post by: mattfx81 on October 01, 2010, 08:18 PM: Id go for mild steel plate aswell as the welder will most likely use a mild steel wire A15(ers70-s2) for the welding. A 4130 welding wire is only used on 4130 when the job is going through a heat treatment process post fabrication so that the whole job contracts and expands at the same rate (in theory).

Matt
Title: Re: i need some metal
Post by: motomagII on October 01, 2010, 09:47 PM: Quote from: Glen on October 01, 2010, 09:42 PM
I assume its possible to TIG weld mild steel?
What frame are you repairing?

frame is secret project cant say at moment
give me couple months ill show ya all
:daumenhoch:
Title: Re: i need some metal
Post by: dan-dare on October 01, 2010, 09:59 PM: as long as it's ferrous greg, it will weld dude. :daumenhoch: :daumenhoch: :daumenhoch:
Title: Re: i need some metal
Post by: Jon The Bassist on October 01, 2010, 10:01 PM: http://www.youtube.com/watch?v=4EL67mjv1nM (http://www.youtube.com/watch?v=4EL67mjv1nM)

...I can't help myself sometimes :-[
Title: Re: i need some metal
Post by: Rodgy1970 on October 01, 2010, 10:32 PM: Quote from: Glen on October 01, 2010, 10:06 PM
Let me rephrase. What I meant was, will mild steel have the nice "over lapping coins" appearance when welded? Most mild steel shite frames, burners etc have really shitty looking welding. Like toothpaste squeezed out of a tube.

AFAIK

toothpaste = MIG

overlapping coins = TIG
Title: Re: i need some metal
Post by: MartyC on October 02, 2010, 04:00 PM: Quote from: rodgy on October 01, 2010, 10:32 PM
Quote from: Glen on October 01, 2010, 10:06 PM
Let me rephrase. What I meant was, will mild steel have the nice "over lapping coins" appearance when welded? Most mild steel shite frames, burners etc have really shitty looking welding. Like toothpaste squeezed out of a tube.

AFAIK

toothpaste = MIG

overlapping coins = TIG

+1
Title: Re: i need some metal
Post by: boofy44 on October 02, 2010, 04:35 PM: wouldn't be a brackens frame would it? ;)