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Old 05-14-2016, 07:36 AM
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Default Suggestions for welding trusses

We are going to be modifying 16 roof trusses that are clear spanning 50' into 2 pieces with new beams supports in about the middle. They are adding two floors into existing downtown building. The existing trusses must be shored up and new supports welded in per engineered drawings. My question is would it be worth while to get the suitcase wire feed out and working instead of stick welding everything. We usually do not use wire in the field, and I am wondering if I should even suggest it to the boss? What wire would you suggest. A flux core or dual shield. I have to assume the trusses might be a little rusty or dirty or painted so might be a pain to clean really well. Plus, we will probably be working off scaffolding or ladders 14' high. Or just best to stick with stick? Thanks for the suggestions.

Brian
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Old 05-14-2016, 10:01 AM
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What is your power source for welding?

What is the thickest section you are welding?
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Old 05-14-2016, 11:15 AM
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If possible I would go with dual shield, it does well with rust and paint, wind could be a problem but with higher gas pressure and a wind block I would think that would be the way to go. As far as welding time it would be cut in half as far as stick goes with clean up be a lot easier. IMO
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Old 05-14-2016, 11:19 AM
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Does the job pay by the hour or bid?



Sent from my ipotato
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Old 05-14-2016, 02:51 PM
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Originally Posted by SmokinDodge View Post
Does the job pay by the hour or bid?



Sent from my ipotato
Exactly. ...

I would use wire for a lot of it, keep a stinger handy for the part that it's too much effort to drag the suitcase to. I had the LN-25 with a 12ft stinger so I would position it in the middle, tied off under a truss and be able to cover 20 some foot without wrasslin it around.
If you have a 10 foot or so stinger section, with tweco connections, and a helper to swap the twecos at the power source, you can cver a lot of area...
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Old 05-14-2016, 06:35 PM
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Originally Posted by Shade Tree Welder View Post
What is your power source for welding? What is the thickest section you are welding?
We have a Miller trailblazer 250 and 280 I think. The 250 is in our work van, but we still not have put the rebuilt engine in the van. The 280 is mounted in a welder pallet/ cage. I was tring to get away from running the engine drives for this job, due to being right downtown, very tight spaces for vehicles and didnt want the noise and dealing with gas cans every day. We have an SP 250 power source that we could run the Miller suitcase wire welder from, as long as we could get the electrician to wire is in a three phase plug.

Probably what we will do is have the electrician wire us in a plug for our Maxstar 150 inverter stick welder. It is only about twenty years old but works good. Biggest thing is when we normally use it, we are lucky to have it in a twenty amp circuit, do we are usually limited to 3/32" rod. But if we get it wired to a thirty amp circuit, we should be good for 1/8" rod.

I have not been able to look at the prints too close, but we will be doing some reinforcement welding of 3/4" round to the existing bar joists probably in 3/16" angle iron and along the bar joist rods. And add more angle for the top chord bearing surface onto the new support beams.

One of those jobs where the boss gave them a quote, and the guy asked that much? Even for the second story steel? Boss said, no, there is steel in the second story? Better get me those prints. Now the boss is saying that with all the joist mods and more steel, that original bid number is going to multiply by 5. I asked for a new welder, but that did not fly very well. But he was looking at some new millers inverters online today, but didn't want to pull the buying trigger.

Brian
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Old 05-14-2016, 06:43 PM
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Originally Posted by digr View Post
If possible I would go with dual shield, it does well with rust and paint, wind could be a problem but with higher gas pressure and a wind block I would think that would be the way to go. As far as welding time it would be cut in half as far as stick goes with clean up be a lot easier. IMO
Wind should not be a problem. This is an existing building, and the bar joists are holding the roof up now. These are being modified to hold the second and third new floors. So everything should be inside work. However, there is no room outside the building to work from. We are working on how we are going to manhandle the new beams into the basement, then the other new beams on the first floor and so on. There are three story building on both sides, front is Main Street of town, and the back is an 10' alley. Not much room for a crane to set up and maneuver. Brian
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Last edited by toprecycler; 05-14-2016 at 06:52 PM.
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Old 05-14-2016, 06:45 PM
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Does the job pay by the hour or bid? Sent from my ipotato
Hour for me, bid for boss! Actually, they want some rough numbers to budget, so I don't know how much wiggle room the boss will have after he gives them a price. I believe we have the job, unless he really gets to high.

Brian
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Old 05-15-2016, 12:10 AM
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A Ben Franklin Store. I bet it's been more than 40 years since I saw one of those signs & they were five & dime's back in those days.
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Old 05-15-2016, 01:58 AM
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A Ben Franklin Store. I bet it's been more than 40 years since I saw one of those signs & they were five & dime's back in those days.
There's one up in Grass Valley, 'bout 10 miles from here. I'll go take you another picture if it fills an empty for ya...

https://www.google.com/search?q=ben+...3vKZ6gWBJVtJzQ
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