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The most recent discussions

Lincoln Ranger won't weld.


November 20, 2017, 3:12 am

I have a Lincoln 8551 weld-power unit that welded fine last December. Started it to use two weeks ago and it won't strike an arc. Polished the armature and the brushes are in great shape, that about ... Read more »

7016/Basic pipe v-up 5G/6G root technique


November 18, 2017, 12:43 pm

What is the technique for upward rooting a V-prep pipe root with 7016 - the likes of Filarc 56S? What is your technique? Read more »

Cheap Gas Lenses vs name brand gas lenses


November 13, 2017, 11:21 pm

Has anybody used the cheap gas lenses for TIG welding that are available off Amazon and other net sites? The cheap ones cost $2.50 each while the name brand ones cost $10 to $12 each. I am wonder... Read more »

Question about TIG Rod


November 2, 2017, 5:02 pm

I have a project for aluminum rod. Tig rod is cheap and available. I see that 5183 has higher shear strengths than 4043. is 5183 stiffer than 4043? If a bird sat on the end of a 24 piece which ... Read more »

TIG and 309L ?


October 12, 2017, 3:26 am

round hay bales . The highest stresses are on the round spike that pierces the bale . That's part of the failed structure , and I'm wondering if it would be a good idea to use the TIG welder and ... Read more »

Rod size 7016 7018 6G pipe butt v-up tube-to-plate fillet?


October 1, 2017, 9:38 am

I want to get practicing for SMAW Coding - the two full-range Codings fillet and butt. I'm in the UK. 3/32 = 2.5mm 1/8 = 3.2mm Would you go for root & fillet-corner 3/32 - 2.5mm 7016 fill an... Read more »

Newbie is going to need help


September 27, 2017, 12:02 am

I haven't tig welded since the mid-1970s when it was still called heliarc, but I have had so many things lately that need welding, that I figured it w as time. I have ordered one of these https://... Read more »

Newbie needs more help


September 15, 2017, 2:07 pm

Greetings and a very happy Friday to all. Today's project is to hog out holes in the pole mount solar panel rails. I am using a pair of H beams on an 8' trailer axle (no camber) to set angle of p... Read more »

Welding equipment comparison UNITOR, DREW, VORANCO


September 13, 2017, 8:31 am

Welding equipment comparison UNITOR, DREW, VORANCO https://www.polytechforum.com/img/5v https://www.polytechforum.com/img/5w https://www.polytechforum.com/img/5x https://www.polytechforum.com/img/5y Read more »

Where to repair a cast iron casting (transmission)


August 17, 2017, 10:09 pm

I bought a used industrial machine (a huge pipe threader). It is a super nice machine in all respects and was rebuilt in 2007. However, the reason why it was sold for nothing is that the cast iron ... Read more »

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The best rated discussions

Cheap vs. expensive auto-dark helmets

rating: 5
  [ 2 ]

I'm in the market for an auto-darkening helmet, and it's remarkable how wide the price spread is. Harbor Freight has a bunch for $49, but if you look around, some run up to $400!!! The only differenc... Read more »

Setting Invertec V205 for welding aluminium plate of tickness mm.1.5

rating: 5

I declare beforehand that I am not practice, my problem is that I need to prepare some aluminium boxes of tickness of mm.1.5,so after cutting the plate I have to bend it and to weld the four corners.... Read more »

Meco Aviator Torch

rating: 5

I recently picked up a box of tools containing a Meco Aviator torch and 18 assorted AV tips. I've done some checking and I can't find any information about the Aviator. The handle says Aviator and do... Read more »

Re: Times change - A new way to cut steel

rating: 5

Who makes a good powerful 7-1/4 worm drive circular saw these days? One that could hold up to metal cutting use. Porter-Cable, Bosch, Skil, Milwaukee? Thanks!!!On Tue, 24 Jun 2003 23:46:47 -0700, Er... Read more »

Tig torch conversion?

rating: 5

Have an inverter TIG which comes with a rather bulky air cooled torch, which is fitted with trigger switches to access program features. It would be a lot more useful to me to be able to fit a waterc... Read more »

Torch/regulator flash arrestor difference?

rating: 5

Is it possible to use a torch flash arrestor on the regulator side? I find it uncomfortable using the arrestors on the end of the torch. Since they sell arrestors for both, I assume there is a diff... Read more »

Alternative to TM2000 lens?

rating: 5

Anyone know of a more cost effective alternative to the TM2000 gas welding lens? THX, Ken Read more »

Lincoln Econotig

rating: 5

I ran across a used Econotig, complete with air cooled torch, very low hours, no bottle at well less than half of retail sticker. This would be for my home shop. I occasionally use an Lincoln Synch... Read more »

GTA welding- Can a tungsten be bent?

rating: 5

I've been doing a bunch of tig welds on OS and HS steel using a standard tig torch with a number 7 cup. The torch is a solid back, no way to use a long tungsten. These welds are in tight spots whi... Read more »

Casting pewter and making molds

rating: 5

At a garage sale, I acquired three pewter plates. It is some kind of commemorative memorabilia, but they say PEW-TA-REX on the back and are heavy. I paid $4 for three of them, and they weigh 5 lbs. ... Read more »

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