Starting a build from a d and d weld kit

[Shadyduk1979]

I have a order in to d and d for a weld kit, trying to find someone with a tig welder to do it, although its not looking good. Can I simply use my MIG to do it or is there not enough penetration?

 

[tommygun2000]

Mig will have better penetration.

 

[JohnDF]

I am curious what folks know about weld penetration? I know welds with a MIG are deep and penetrating. I don't have a lot of experience with TIG> Any info appreciated! Take Care and God Bless, -John

 

[celicaslave]

TIG, when done properly has 100% penetration and a narrower heat affected zone, which is important if you are not going to heat treat the receiver when the welding is complete. The disadvantage of using MIG is that the short arc welding process creates a more brittle weld, which may lead to failure. The DIY Mini-Uzi from the UziTalk home page used MIG to weld the receiver so I would check with the author to see how the durability has been over time.

 

[Ayessick]

Done properly, either process could be used with satisfactory results. I would be more selective when choosing a filler metal for the MIG process due to its inherent flaws. With TIG the quality of the weld will be much greater, cleaner, and if done right require far less clean up. The idea that MIG is a deeper penetrating process is a fallacy, if you compare the two processes amperage to amperage you will find that the TIG process has far more penetration capabilities. As stated above MIG will generally give a more brittle weld and has a tendency to isolated spots of non-fusion. Personally I'd never let anyone MIG weld anything on a firearm of mine, but I've done this for a living for a long time. If you have any specific questions I'm sure we can get them answered for you.

 

[Shadyduk1979]

I will post pictures later today, the receiver is all welded up and assembled. It cycles just fine without but I am having a tough time pulling the bolt back and getting it to chamber a round once I get a mag in it. I'll have a look, hopefully tonight to see if I can tell where my problem is

 

[Shadyduk1979]

She seems ok now that i lubed everything up, i remember having similar issues due to paint when i did my AMD. I hope to get it to the range tomorrow

I started by attaching the forward hand guard and using that as a guide to weld on the posts

Pretty terrible welds, but i wanted to raise the weld up so i could grind it flush, mostly because i cannot do anything the easy way lol

Added on the trigger group lug

A pic of the blocking bar that made me hate my life, we had to enlarge the weld holes to get good weld penetration but it is in there now.

Finally all ground down and painted

Another view, that brass piece is what i used as a spacer, as the pin hole is 9mm and using the SMG lower i needed to step it down to 8mm

A look at my fire control group, you can see the only shiny part is the blocking bar to keep the gun from being switched into full auto, thus keeping me from going to federal pound me in the ass prison. also not all receivers require you to change to a semi auto trigger group

And finally the completed product

I do have a issue sometimes when trying to feed from the left side of the mag, but this may be simply because i have been doing it without firing it, we shall see though.

 

[06sandstone]

Looks great ! Pm inbound

 

[Shadyduk1979]

I took it to the range today, the first 5-10 rounds were tough. Had some fail to feeds and fail to ejects but after that it ran great. I did have a 2 fails to eject after the last round in the mag but they cleared when I cycled the bolt. I put a total of about 350-400 rounds through it. I'm calling it a good build

 

[warpig]

very nice build

 

[mob]

hey warpig are you the same name/fame of the paintball world ?

 

[QUE45]

Nice build. I tig weld 90% of the time unless I'm in a hurry.