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Stick welding 11-27-2012 22:22:01 96.53.210.246 Report to Moderator	I don't know how to post a link but I was reading some of the latest news from Edmonton Exchanger. [Oct 12]- Fabrication of Pressure Vessel Heads measuring 34" I.D. and 7" thick Edmonton Exchanger is currently working on a job for a customer that involves the fabrication of (8) pressure vessel heads that measure 34" I.D. and 7" thick. [Sep 11] - Fabrication of large 6.5" thick, 93,000 pound Pressure Vessel Shell We recently formed a 6.5" thick, 93,000 pound pressure vessel shell in our Monster Rolls steel plate rolling machine. The shell measured 126" I.D. and 121.25" long. That's some BIG stuff! Could keep Lanse busy for month's welding that stuff up. Would need a lot of preheat too. LoL Lanse, ask them Hobart about the Alberta welding trade. [Reply]   [No Email]
NCWayne 11-28-2012 19:00:43 69.40.232.132 Report to Moderator	Re: BIG steel for Lanse! in reply to Stick welding, 11-27-2012 22:22:01   The old guy that was my 'go to guy' when I needed something done that I couldn't often worked for places like Westinghouse. I've seen a few of the special, liquid cooled nozzels he made for them that they used to weld up turbine casingings. The nozzels were rectangular, several inches long, and had cooling passages running through them. The idea was to keep them cool as they started at the bottom of the V notch and welded their way up to the top. He said they also used kinkers so the electrode wire so it would 'wave' as it came out of the nozzle and make a wider bead than it would have running straight. One thing when you get into the BIG stuff, there are alot of really cool tools out there. [Reply]  [No Email]
Lanse 11-28-2012 08:24:18 209.251.8.126 Report to Moderator	Re: BIG steel for Lanse! in reply to Stick welding, 11-27-2012 22:22:01   Holy cow!! Thats insane!! I'd love to weld that kinda thing lol. I've been at Hobart for two days... Last night we learned about backwelding, where you gouge out the back side of a weld and re-weld it from that side on purpose. Our teacher said the last time he did it in the field was on a 2" thick boiler shell. We don't do it at Hobart, but Im tempted to get some 1" plate from the steel yard and try it myself! I still don't understand why one would do that instead of welding it open root, or in a double bevel configuration, but still... That was pretty cool to see. Wonder how many pounds of electrode it takes? :) [Reply]  [No Email]
Thomas(AB) 11-28-2012 03:41:42 207.107.204.34 Report to Moderator	Re: BIG steel for Lanse! in reply to Stick welding, 11-27-2012 22:22:01   Couldnt find the actual articles, but heres the Companies website. Edmonton Exchanger [Reply]  [No Email]
Stick welding 11-28-2012 20:27:39 96.53.210.246 Report to Moderator	Re: BIG steel for Lanse! in reply to Thomas(AB), 11-28-2012 03:41:42   Thanks for posting the link. I went to school with the foreman. He lucked out and got offered an apprenticeship after going there for work experience in 1981. He's been there ever since. [Reply]  [No Email]
Puddles 11-28-2012 03:48:29 24.113.77.208 Report to Moderator	Re: BIG steel for Lanse! in reply to Thomas(AB), 11-28-2012 03:41:42   Now there is a set of rollers every home shop should have! :lol: [Reply]  [No Email]
Stick welding 11-28-2012 17:14:42 96.53.210.246 Report to Moderator	Re: BIG steel for Lanse! in reply to Puddles, 11-28-2012 03:48:29   That's the new "Monster rolls". The largest capacity plate rolls in N. America, 8" thick capacity cold and 12" thick hot (1650 deg's)! The articles are under newsroom and there's a picture of the 7" thick heads. There's a 100 ton overhead crane to support the rolls. Then they have their house built 3000 ton head press... Lanse, back gouging is very common on thick pressure vessels to ensure full penetration with no slag or other impurities. Shells are usually done with a root pass and sometimes a hot pass, followed by sub arc and then the the root pass is gouged out on the other side into the sound weld. Then it is filled up with sub arc. Nozzles coming out the side are usually all done with stick but flux-core may be used more now. They are tacked in place and often braced so they don't move. Then they are welded on the inside and back gouged from the outside into the sound weld. Even after gouging, you have to clean it up real nice with a grinder to get rid of left over carbon. Even though there is about a 30 deg. bevel to get full penetration, it can be trick getting 100% penetration into the weld done from the inside. [Reply]  [No Email]
Puddles 11-28-2012 17:37:16 24.113.77.208 Report to Moderator	Re: BIG steel for Lanse! in reply to Stick welding, 11-28-2012 17:14:42   Lanse to add to stick welding post. It won't take you long to learn what to look for when carbon arcing. A grinder will cover up things, where a carbon arc will open them right up so you can see the bad things more easily. [Reply]  [No Email]
Stick welding 11-28-2012 20:25:01 96.53.210.246 Report to Moderator	Re: BIG steel for Lanse! in reply to Puddles, 11-28-2012 17:37:16   When gouging hardfacing off so pipe sections can be welded together, you could see a change in color, if you looked carefully, that told you when you were through the hardfacing. Even the slightest bit of hardfacing would take forever to grind off. Another big advantage to gouging is doing repairs. It will show cracks that could be very hard to find by grinding. It's also a lot faster. [Reply]  [No Email]