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I have only welded a few small projects, and I will probably take a class before attempting a structurally critical project such as the boat trailer I want to build, but, in the mean time, I have a question about galvanized steel. This will be a salt water trailer, so corrosion is a major concern. I understand galvanized steel will slow corrosion, but I'm confused about the areas around the welds. If the galvanic coating is either removed prior to welding, or burned off during the welding process, and then touched up with zinc rich paint, how is this any better than simply building with regular steel and painting the whole thing with zinc rich paint? I'm particularly confused about using tubular steel, since there isn't any way to recoat the interior of the tube once it's welded. Am I missing something? I'm guessing that major manufacturers add the galvanic coating after welding is completed? So, I guess my question is whether it is worth the trouble to work with galvanized steel (fume issues) as a DIY project. Or, maybe it just doesn't make sense to do this as a DIY project at all?
Reply:Welding galvanized steel is generally considered a no-no.Zinc vapors and grinding dust are health hazards.The boat trailers I've worked on were have been good quality paint over steel. So, weld up your trailer and then take the time to prime and paint it properly. Basic maintenance of brakes, lights, wheel bearings and touching up the paint will allow many years of solid service.Be wary of The Numbers: Figures don't lie,. but liars can figure.Welders:2008 Lincoln 140 GMAW&FCAW2012 HF 165 'toy' GTAW&SMAW1970's Cobbled together O/A
Reply:Originally Posted by colinml I'm guessing that major manufacturers add the galvanic coating after welding is completed?
Reply:Thanks for the responses. I think I may look into the possibility (cost/hassle factor) of having it plated compared to finding a used galvanized trailer on Craigslist. I also need a fresh water trailer for a boat I'm building, so maybe that might be worth doing in painted steel myself.
Reply:Originally Posted by mike837goWelding galvanized steel is generally considered a no-no.Zinc vapors and grinding dust are health hazards.The boat trailers I've worked on were have been good quality paint over steel. So, weld up your trailer and then take the time to prime and paint it properly. Basic maintenance of brakes, lights, wheel bearings and touching up the paint will allow many years of solid service.
Reply:Saltwater will eat a galvanized trailor, just not as quick. Aluminum is the way to go. In freshwater painted steel is fine. I ran a galvanized air over hydraulic boat trailer in south Fl, everytime I dipped it in salt water it got a fresh water rinse, it had garden hose connections to flush the brakes. Every year we replaced the entire disc brake assembly. Salt water eats everything.
Reply:Originally Posted by colinmlI have only welded a few small projects, and I will probably take a class before attempting a structurally critical project such as the boat trailer I want to build, but, in the mean time, I have a question about galvanized steel. This will be a salt water trailer, so corrosion is a major concern. I understand galvanized steel will slow corrosion, but I'm confused about the areas around the welds. If the galvanic coating is either removed prior to welding, or burned off during the welding process, and then touched up with zinc rich paint, how is this any better than simply building with regular steel and painting the whole thing with zinc rich paint? I'm particularly confused about using tubular steel, since there isn't any way to recoat the interior of the tube once it's welded. Am I missing something? I'm guessing that major manufacturers add the galvanic coating after welding is completed? So, I guess my question is whether it is worth the trouble to work with galvanized steel (fume issues) as a DIY project. Or, maybe it just doesn't make sense to do this as a DIY project at all?
Reply:Originally Posted by Old SkoolWhere's welding galvanized considered a no-no?
Reply:I welded galvanized structural beams and pipe for years. First time I got poisoned was in the early 70's. I've been poisoned at least a dozen times, never worn a respirator, I'm still here! Now the first 8 to 12-hours you'll think you're going to die, but you live, just to do it another day! Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Originally Posted by CEPI welded galvanized structural beams and pipe for years. First time I got poisoned was in the early 70's. I've been poisoned at least a dozen times, never worn a respirator, I'm still here! Now the first 8 to 12-hours you'll think you're going to die, but you live, just to do it another day!
Reply:Originally Posted by mike837goWhy not spend a couple of bucks on the right resperator and save the trip to the doctors and the chelation?
Reply:http://www.anvilfire.com/iForge/tuto...n=safety3/demo
Reply:Originally Posted by RojodiabloWithout some decent knowledge of the effects of exposure, it is a solid No-no. Without the right filters for a respirator, and ample fume removal..... welding galv. is a no-no.In your garage, with the door closed...... it's a definite NO.
Reply:Originally Posted by Kelvinhttp://www.anvilfire.com/iForge/tuto...n=safety3/demo
Reply:I weld galv a lot. If it is shiny, power wire brushing gets rid of enough to avoid most of the fumes. If it is hot dipped and dull, a little grinding is best. If you have a lot to do then wear a respirator. When I am done i paint it with "Brite Zinc" only because the color matches well. Many of the zinc sprays are dull gray and obvious. Just use common sense, if it's hot enough to burn and throw off fumes, wear protection or weld in a breeze. People do it every day.
Reply:Originally Posted by AceSaltwater will eat a galvanized trailor, just not as quick. Aluminum is the way to go. In freshwater painted steel is fine. I ran a galvanized air over hydraulic boat trailer in south Fl, everytime I dipped it in salt water it got a fresh water rinse, it had garden hose connections to flush the brakes. Every year we replaced the entire disc brake assembly. Salt water eats everything.
Reply:Originally Posted by 12345678910YesBuild it, then it gets blasted, dipped in acid, then dipped in the plating solutions.at 5cents per pound, it's cheaper and more durable than paint is for me.Powder coating may meet your needs though.
Reply:2 part coal tar based epoxy.Problem over. I heated it to about 150 degrees to make it brush-able.Bubble gumTooth pixDuct tapeBlack glueGBMF hammerScrew gun --bad battery (see above)
Reply:Originally Posted by SuperArc5cents per lb???? Whoa, obviously you haven't been to an electroplater in about 30 years. Or at least a U.S. Based plating company.
Reply:Originally Posted by 12345678910Thanks for assuming I'm a know nothing fool.That's current pricing from a local plater in CanadaThe guy is Amish running a farm based operation mostly doing gates, farm equipment and that sort of thing.His overhead is low, but I've seen samples and they are good.
Reply:Originally Posted by 12345678910That's current pricing from a local plater in CanadaThe guy is Amish running a farm based operation mostly doing gates, farm equipment and that sort of thing.His overhead is low, but I've seen samples and they are good.
Reply:My understanding is that you can weld galvanized with a P100 filter, since the zinc fumes immediately oxidize in the atmosphere and form an airborne powder, or something like that. No fancy "organic vapors" charcoal filters or anything required.There's a world of difference between welding galvanized pipe outdoors with a fan blowing or the breeze and putting a bunch of galvanized pipe in your forge in a closed shop.Everlast PA160-STH... and that's about it!
Reply:Originally Posted by 76GMC1500Hot dip galvanized will certainly hold up better in salt water than aluminum. There are too many electrolysis and crevice corrosion issues with aluminum.
Reply:Originally Posted by SuperArcI never called you a fool, but you know what they say when one can @$$-u-me something. At .5 cents per lb, the guy isn't making money, he's loosing money big time. What's his name and number? I'd like to get a quote and maybe give him some more business.
Reply:I have heard that drinking milk helps with the effects of galvanize poisin. It seemed to help, fourtunatly I don't work with it much anymore.I know a lot of welders who drank milk when welding galvanized material. I never drank milk my self. My theory was when I started feeling sick, that was my body telling me I had enough. Milk masks your symptoms.Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Originally Posted by 12345678910... and I don't need anyone telling him that his prices are too low....So I'll just keep his name to myself.
Reply:Originally Posted by SuperArcYeaahhhh that's about what I thought. Too good to be true. |
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发表于 2021-8-31 23:26:41