Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Welding

SFT Search:   
Reply
 
Thread Tools Display Modes
  #21  
Old 03-02-2020, 01:15 PM
Shade Tree Welder's Avatar
Shade Tree Welder Shade Tree Welder is offline
Grumpy Bastard
 
Join Date: Jun 2004
Location: Kankakee County, IL
Posts: 20,187
Default

Quote:
Originally Posted by JavaKing View Post
I have a flux core welder and need to weld a 3/4 copper pipe. I do know that most people say no to this type of welder, but this is all I have to work with, know other way. Is there a wire that I could try that might just get me threw this time.
Quote:
Originally Posted by JavaKing View Post
I was going to use map gas but would not get pipe hot enough to melted the silver copper brasing wire pipe is copper refrigerant line OD 1 inches
Okay, too many nice guys on this forum. That is not me.

You clearly do not have the knowledge, skills or equipment to do this job.

If you do buy the wire that dubby posted, you need Argon to run it. You state
you only have a flux core welder. Also you will need 145-185 amps to run
that wire. I am gonna guess you don't have a machine that can reliably
deliver that amperage. Copper alloys need a lot of heat to weld. I suggest
you get a oxy fuel rig to properly braze copper alloys. Propylene will work or
acetylene, if you are buying new I would go Propylene.

But with where you are at, do you really want to tackle brazing 1" refrigerant
lines. I strongly suggest you hire a professional with the right equipment and
training. Clearly this is a commercial application, are you willing to take on
the liability? Are you insured for this type of work?

https://www.harrisproductsgroup.com/...-GMAW-MIG.aspx
__________________
Shade

"Prepare to defend yourselves."
-- Sergeant Major Basil L. Plumley, Ia Drang Valley
Reply With Quote
  #22  
Old 03-03-2020, 10:47 AM
JBFab JBFab is offline
Elite Member
 
Join Date: Oct 2006
Location: NorthCentral Wisconsin
Posts: 1,343
Default

Quote:
Originally Posted by Shade Tree Welder View Post
Okay, too many nice guys on this forum. That is not me.

You clearly do not have the knowledge, skills or equipment to do this job.
Thank God, finally a voice of reason.

Sent from my mobile device using ShopFloorTalk mobile app
__________________
I believe the appropriate metaphor here involves a river of excrement and a Native American water vessel without any means of propulsion.
Reply With Quote
  #23  
Old 03-03-2020, 11:57 AM
Shade Tree Welder's Avatar
Shade Tree Welder Shade Tree Welder is offline
Grumpy Bastard
 
Join Date: Jun 2004
Location: Kankakee County, IL
Posts: 20,187
Default

Quote:
Originally Posted by JBFab View Post
Thank God, finally a voice of reason.

Sent from my mobile device using ShopFloorTalk mobile app
Oh, I think a number of people would disagree with you,
but will enjoy the vote of confidence while it lasts!!!
__________________
Shade

"Prepare to defend yourselves."
-- Sergeant Major Basil L. Plumley, Ia Drang Valley
Reply With Quote
  #24  
Old 03-03-2020, 12:20 PM
toprecycler's Avatar
toprecycler toprecycler is offline
Administrator
 
Join Date: Jan 2009
Location: Petoskey, Michigan
Posts: 4,652
Default

Quote:
Originally Posted by JBFab View Post
Thank God, finally a voice of reason.

Sent from my mobile device using ShopFloorTalk mobile app


Suck up!


Sent from my iPhone using ShopFloorTalk
__________________
Brian

You don't know what you don't know.

"It's what you learn after you know it all that counts." John Wooden
Reply With Quote
  #25  
Old 03-03-2020, 12:29 PM
Shade Tree Welder's Avatar
Shade Tree Welder Shade Tree Welder is offline
Grumpy Bastard
 
Join Date: Jun 2004
Location: Kankakee County, IL
Posts: 20,187
Default

Quote:
Originally Posted by toprecycler View Post
Suck up!


Sent from my iPhone using ShopFloorTalk
Brian, don't do that when I am eating, now I have to clean off
the ham and cheese sammich from my monitor...
__________________
Shade

"Prepare to defend yourselves."
-- Sergeant Major Basil L. Plumley, Ia Drang Valley
Reply With Quote
  #26  
Old 04-11-2020, 09:23 PM
LW Hiway's Avatar
LW Hiway LW Hiway is offline
Lord of the Minions
 
Join Date: Jun 2005
Location: Fuck Lake Charles
Posts: 21,401
Default

Quote:
Will not hold pressure on a 1 inch OD refrigerant line
I know some folk like to tackle the unknown, but geeeewizzzzzzkers.

I'd love to see a pic of what type of system he's working.

Must be a Russian Shuttle?
__________________
God, if you would grant me one request through Prayer, please help me be the Man my Dog thinks I am. Please.

Quoting "The Hunt". "A man will walk into hell with both eyes and arms wide open. His dog will know better."

I never thought I'd live long enough to become a grumpy old bastard. Here I am, killing it!
Reply With Quote
  #27  
Old 04-12-2020, 12:03 AM
monckywrench's Avatar
monckywrench monckywrench is offline
trust but verify
 
Join Date: Feb 2007
Location: Elsewhere
Posts: 4,373
Default

Quote:
Originally Posted by Shade Tree Welder View Post
Copper alloys need a lot of heat to weld. I suggest
you get a oxy fuel rig to properly braze copper alloys. Propylene will work or
acetylene, if you are buying new I would go Propylene.

But with where you are at, do you really want to tackle brazing 1" refrigerant
lines. I strongly suggest you hire a professional with the right equipment and
training. Clearly this is a commercial application, are you willing to take on
the liability? Are you insured for this type of work?

https://www.harrisproductsgroup.com/...-GMAW-MIG.aspx
Good advice though if OP is determined he could braze a bunch of fittings for practice first. Paying a pro would make the most sense as the pro can backpurge the line which I suspect OP cannot, then pull a vacuum before charging. If he doesn't backpurge his joint could be compromised. My HVACbro purges as a rule and he's been at it a few decades.

It's worth buying the equipment since it pays off over time. My trucks I fixed paid for my vacuum pump, nitrogen regulator etc. I've leak checked using shielding gas (same CGA-580 cylinder valve so why not?) which costs more than nitrogen per cylinder but pressure test or purging doesn't use much gas. My HVAC bro showed me how to troubleshoot my heat pump, and since he's a friend I paid him to swap the compressor, contactor (he always replaces contactors and motor capacitors with every compressor change which makes perfect sense, my contactor still worked but when I broke it open the contacts were toast) and dryer and charge the system. Next time I'll do it myself since it's easier access than auto AC. I encourage any weldor to do their own HVAC work on basic systems as there's plenty of info out there.

I have both LP/polypropylene and acetylene regulators and since I use acetylene for gas welding I'd get an acetylene regulator unless I needed serious LP or poly flow, but for someone just heating/brazing/cutting LP/poly are more than adequate and the ability to run more pressure is nice. So is grabbing a BBQ jug for portable work.

BTW the main difference between an LP/poly/etc rosebud and acetylene rosebud is the LP versions protect the easily blown-out flame from disruption. Before I scored some LP rosebuds I figured out I could shorten then slot an old Tweco MIG nozzle and clamp it to my acetylene rosebud leaving about 3/4" extending past the rosebud tip as a "flameholder". Works fine and I still have it. I could probably shorten the nozzle to ~ 1/2" but didn't bother since it works as it should. I think I posted it here a long time ago.

Useful place to lurk and learn: https://www.hvac-talk.com/vbb/
Reply With Quote
  #28  
Old 04-12-2020, 08:06 AM
digger doug's Avatar
digger doug digger doug is offline
Not to be used as a Flotation Device
 
Join Date: Jan 2008
Location: NW Pa
Posts: 12,359
Default

Quote:
Originally Posted by LW Hiway View Post
I know some folk like to tackle the unknown, but geeeewizzzzzzkers.

I'd love to see a pic of what type of system he's working.

Must be a Russian Shuttle?
Like adding a hot tap for your house from a nearby 36" 2000 psi transmission
line "when nobodys lookin'..."...
Reply With Quote
  #29  
Old 04-12-2020, 01:59 PM
GWIZ's Avatar
GWIZ GWIZ is offline
SFT Historian
 
Join Date: Feb 2006
Location: USA
Posts: 7,049
Default

The OP decided on Brazing with a new question.

brazing copper tubing need rods
https://www.shopfloortalk.com/forums...ad.php?t=51786
__________________
*
*
The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment. ~Warren G. Bennis
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 08:54 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.