K2 / Proflex Riders Group

General => Tech Forum => Topic started by: Thunderchild on December 12, 2008, 07:55:35 pm

Title: 5000 and Evo repair
Post by: Thunderchild on December 12, 2008, 07:55:35 pm

Thought everyone would like to see one of our own's handiwork.  Shovelon did a great repairing two frames for me.  See the pictures. 

Thunderchild



(http://www.alpinebike.com/umbphpbb2/files/img_1162__small__999.jpg) 

(http://www.alpinebike.com/umbphpbb2/files/img_1161__small__735.jpg)

Title: Re: 5000 and Evo repair
Post by: orange on December 13, 2008, 01:34:22 am

we all need a Shovelon on our doorstep - shame he 6000 miles away!!

Title: Re: 5000 and Evo repair
Post by: Happy Valley on December 13, 2008, 03:30:37 am

Looks great, it's hard to find someone capable and willing to even tackle that.
Curious, is heat treating necessary afterward?

Title: Re: 5000 and Evo repair
Post by: shovelon on December 13, 2008, 08:11:54 am

Quote from: Happy Valley on December 13, 2008, 03:30:37 am

Looks great, it's hard to find someone capable and willing to even tackle that.
Curious, is heat treating necessary afterward?

Hey Thanks!

7005 alum and lite/fast weld(on the edge of cold cracking) requires no heat treat, just a short period of non load time to allow a stress relieve(shake-out) of the area and allow a slight age hardening(I recommend 1 week). The welding is localized and not allowed time to fully heat the heat affected zone to allow significant annealing. In the foundry, 7005 is an alloy that takes many hours to form the desirable grain structure and thus takes many hours to anneal. Many plastic mold makers use 7000 series alum becuase the short heat time has no effect on the original heat treat.

Think of it this way. If your skin touchs something hot momentarily, little damage done, healing is quick. The more damage, the longer it takes to heal. If you linger on the hot spot, the damage will go very deep, and healing is irrepairable, thus a skin graft. Same with heat treat, there is a threshold. Go beyond the threshold, and you have ruined the heat treat. Homey don't do dat. ;)

Title: Re: 5000 and Evo repair
Post by: The Mont on December 13, 2008, 09:06:39 am

Shovelon

did you at least quench the welded area ?

Title: Re: 5000 and Evo repair
Post by: shovelon on December 13, 2008, 11:34:18 am

Quote from: The Mont on December 13, 2008, 09:06:39 am

Shovelon

did you at least quench the welded area ?

Good Question.

Nope.

 I would only do that with 6061 (as that alloy has a very short annealing time) to bump the temper into higher ageing zone if time is of the essence. Usually on parts with alot of continuous welds that allows it to detemper too much.

Title: Re: 5000 and Evo repair
Post by: bike kid on December 13, 2008, 07:32:58 pm

what was wrong with it in the first place?

Title: Re: 5000 and Evo repair
Post by: Willie_B on December 14, 2008, 05:33:29 am

This is where it started.
http://idriders.com/proflex/smf/index.php?topic=3088.0