Posted by 135 Fan on January 29, 2010 at 11:20:19 from (68.149.56.30):
In Reply to: Re: Welding question posted by KYfarm on January 29, 2010 at 05:11:06:
In order to do structural welding in Canada you have to have a CWB(Canadian Welding Bureau)ticket. It is a higher standard than an AWS structural ticket. You have to do a seperate test for every welding process and every welding position. Each test cost's $100 so it can be a little expensive getting all your tickets! The test uses a back up bar between two plates about 3/8" apart. One plate has a 45deg. bevel and the other plate has no bevel. The first pass has to be run hotter than normal on the non beveled plate in order to get 100% penetration into the corner but the bead can't be too wide because another pass has to go on the beveled side and tie into the first pass with 100% penetration into the back up strip. After that the heat can be turned down and weld is relatively easy. Ticket's have to be renewed every 2 years, I believe, the same as pressure tickets. For stick the test's are done using 7018. A lot of good pipe welders fail the CWB test the first time because they don't run a hot enough first pass. For MIG there is no short circuiting transfer qualification, since it would never have enough penetration. There is a qualification for spray transfer MIG however, but MIG is rarely used. Why? Because of all position Flux-core wire that is on the market. Flux-Core and MIG are similar but aren't interchangable. They are a different process. Outershield(lincoln) is a flux-core wire and not a MIG wire. Sub-Arc is widely used for large beams, spiral pipe, pressure vessels and anything else that requires a huge amount of weld, X-ray quality and high production. It is a different process as well and has been around since the 20's. One of the first applications of sub-arc was welding beer kegs. Of all the welding processes it is perhaps the ultimate for strength. I can discuss welding with you KY and answer your questions since you obviously know a lot about welding. Some of the other's on here are so far out in left field, it's almost pointless trying to explain things to them. Dave
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