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Hi,I've asked this on another forum and got no response..Hopefully I can find the right answer here.. Please let me post a disclaimer first, I am a female and don't know many technical terms so please bare with me I am currently in the market for a horse float and I am doing many hours of research before I buy.I am noticing a lot of manufacturers are now making their floats from galvanised steel (not hot dipping them afterwards, but constructing them from galv, so grinding back the galv, welding then covering exposed metal with a spray).I like this idea from a rust proofing perspective, however I have heard that because the temperature of the metal is changed when it gets galvanized that it is not useful for making structures such as trailers and horse floats that will bare load and flex and move on the road surface, especially for floats where the movement of the horse during transit is also a factor on the chassis.The reason I'm told this is due to the fact that the welds will crack, or the area immediately surrounding the weld will crack if used for this application and that galv is fine to use on stationary structures, but not for anything that flexes such as a horse float will obviously do.I've been advised to only buy a float that has been made from black and then galv dipped, but I can't find any manufacturers that do this, I've been told I can't even request it as there are no baths big enough.So, I guess what I'm wanting to know is, are the reports I've been given correct in that a horse float chassis/frame made from galvanized steel will crack due to welding?Any help would be greatly appreciated, I've googled this and even read a study about welding galv steel, however the only information I can find is for stationary structures, which also seem to be bolted in most cases and don't rely on welds alone which is making me think maybe this information is correct? I really would like to buy a galv framed float, but not if there is going to be issues with it (the galv ones also seem to come at a premium cost).
Reply:I have erected buildings and mezzanines that were all galvanized steel. Strength is not lost in the hot dip process. The only concern is that after something has been galvanized, if you need to weld it be sure to grind the joint to bare metal before any welding is done. After a cold galvanize spray is used to cover the weld area. I have also welded without grinding off the galv. and it can be done in a pinch. Wear long sleeves for that though. Any one who has done it knows what I mean.CERTIFICATIONS:7018M- H.V.O10718M- H.V.O11018M- H.V.O9N10- H.V.O71T-1-HYM- H.O.V100S1 PULSE ARC 0,035- H.O.V100S1 PULSE ARC 0.045- H.O.VER70S-3 PULSE ARC 0.035 H.O.VER70S-3 PULSE ARC 0.045 H.O.VER5554- H.O.V
Reply:stationary structures move and flex. the bolts are there for efficiency and to eliminate field welding, and the boltholes are in plates that are shop welded to the structural members.. the heat of welding is many times the heat of hotdipping so it doens t matter when the dipping occurs.. the heat of welding does create weakened zones, true for any welding..but they still have sufficient strngth for the intended purpose..after the welding brush the area clean and coat with a high-zinc cold galvanizing compound ..Last edited by weldbead; 02-25-2012 at 05:53 AM.
Reply:So basically they are saying its OK for a piece of steel to be galvanized, then ground for welding and sprayed afterwards. The weakness in the weld zone will occur whether its bare steel or galvanized steel.All the Horse Trailers I am asked to fix are rotted out from the lack of cleanliness to keep dirt, sawdust, hay chaff and manure off from the metal parts. |
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发表于 2021-8-31 23:57:52