240z - fabbing new front rails

[Patcon 1,802]

8 minutes ago, wheee! said:

If you surround the welded area with strong magnets, the oxygen atoms are pushed away hence no need for gas..... 🤣

Pppfffftttt! 😛

[Captain Obvious 2,089]

3 hours ago, Patcon said:

The straight Argon doesn't work well???

Well, it's not like it doesn't work at all, but I didn't like the results. I tried it because I had the TIG (which requires 100% argon), and my welding gas guy told me I could share a tank between the two machines and run straight up argon on both. I found the weld beads noticeably tall and lower penetration. So now I unfortunately have two bottles. One tank 100% argon for the TIG and another tank of 75% argon 25% CO2 for the MIG.

I did some digging online and the general consensus is that my results were typical. Here's a pic from someone else that describes what happens Less heat into the workpiece so you end up with a tall narrow bead and lower penetration:

Here's some web pages with some good info:
https://welditu.com/welders/mig/tips-mig/mig-welding-with-100-argon/

http://shdesigns.org/Welding/gasmix.shtml

All that said, I've read on the internets that if you surround the welded area with strong magnets, the oxygen atoms are pushed away hence no need for gas. I'm not sure that would work for 100% argon though since the argon is inert.

[Patcon 1,802]

So you were saying the 100% Argon didn't work for MIG not TIG?

 

[Captain Obvious 2,089]

I'm saying that for MIG you should use the CO2 / argon blend.

For TIG you should use 100% argon.

And also just to be clear... That applies to steel welding only. When you get into the non-ferrous stuff, the rules change.

[wheee! 1,765]

Ferrous Bueller?

[Captain Obvious 2,089]

Hahaha!!    

I guess cabin fever is setting in?

[ConVerTT 322]

13 hours ago, Captain Obvious said:

I'm saying that for MIG you should use the CO2 / argon blend.

For TIG you should use 100% argon.

Agreed 100 percent.  MIG + 100% Argon = no beuno 

[Captain Obvious 2,089]

I never went back and gave that feedback to my gas guy. I'm thinking he just wanted to sell more argon.   

[240260280 1,940 1 Vehicles]

16 minutes ago, ConVerTT said:

Agreed 100 percent.  MIG + 100% Argon = no beuno 

It seems to be the way to go for Mig + Aluminum.

[ConVerTT 322]

45 minutes ago, 240260280 said:

It seems to be the way to go for Mig + Aluminum.

Yes that is true for aluminum, absolutely.  (But not much Al in a Datsun frame rail 😳😳)

 

[Patcon 1,802]

5 hours ago, ConVerTT said:

Yes that is true for aluminum, absolutely.  (But not much Al in a Datsun frame rail 😳😳)

 

True, but smoothing out an EFI intake might be a good place to TIG some AL or relocating the valve cover vent

[wheee! 1,765]

Bin there dun that!

[Patcon 1,802]

7 minutes ago, wheee! said:

Bin there dun that!

That's what made me think of it

[ConVerTT 322]

31 minutes ago, wheee! said:

Bin there dun that!

Same.  V-band turbo inlet anyone ....

e

 

[ConVerTT 322]

44 minutes ago, Patcon said:

True, but smoothing out an EFI intake might be a good place to TIG some AL or relocating the valve cover vent

Agreed.

[grannyknot 1,630 2 Vehicles]

7 hours ago, ConVerTT said:

Agreed 100 percent.  MIG + 100% Argon = no beuno 

Unless of course you are MIG brazing with Silicon Bronze, then you want 100% Argon.  You can get away with 75/25 mix but you get better control with straight Argon.

[ConVerTT 322]

So getting back to frame rails ...

Without any c25 for the weekend, I was forced to play “Game of Clecos” ....

 

Fitting this rail was much easier than the first one.  The jig really makes it simple to get everything in the proper alignment....

 

h

 

Edited February 19, 2019 by ConVerTT
Typo

[ConVerTT 322]

22 minutes ago, grannyknot said:

Unless of course you are MIG brazing with Silicon Bronze, then you want 100% Argon.  You can get away with 75/25 mix but you get better control with straight Argon.

Now you guys are just showing off ...😀😉

[ConVerTT 322]

Stock rad clears the trimmed up rails nicely.  Aside: the stock rads sure are beefy.  Were they meant to serve as a structural brace?

 

[grannyknot 1,630 2 Vehicles]

2 hours ago, ConVerTT said:

Now you guys are just showing off ...😀😉

Okay a little bit but Si/Bz is perfect for what you are doing right now,  joining thin ga metal without the heat warping.

[Captain Obvious 2,089]

Wait, wait, wait...

So the guy using a laser guided custom made body panels is telling someone else that they are showing off???    

2 hours ago, ConVerTT said:

Now you guys are just showing off

[wheee! 1,765]

You should see the shark holding it...

[Captain Obvious 2,089]

LOL!!! Are they ill-tempered as well? 

[wheee! 1,765]

Stock rad clears the trimmed up rails nicely.  Aside: the stock rads sure are beefy.  Were they meant to serve as a structural brace?
 

Are you going to use the stock rad?

[ConVerTT 322]

2 hours ago, wheee! said:

Are you going to use the stock rad?

Possibly!  They seem pretty stout.  Depends on the final engine configuration so I trimmed the rails to keep the option open.