https://www.nytimes.com/interactive/...ain-crash.html has some clear pics. I've never run a stud gun (except the little auto body variety) so I'm curious what causes poor penetration in typical use.What do those with experience see in those pics and how do you personally set and test a stud gun before welding? What amp range would be typical for that job?Last edited by farmall; 06-13-2021 at 09:13 AM.
Reply:I get some kind of error message on that site, perhaps because of mobile phone? Something about limited articles.
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Reply:
Originally Posted by Oscar
I get some kind of error message on that site, perhaps because of mobile phone? Something about limited articles.
Reply:The link came up for me and I just clicked no to subscribing. Politicians whether they be local, by district or federal should never be the ones deciding when large projects should be in service. Ie/ they shouldn't be using the project for political gain. 3rd party inspections by qualified firms should be mandatory and any deficiencies be corrected before it goes into service. I don't think the studs breaking or improper welding on them is the main cause of the failure but certainly contributed to it. I think insufficient cross bracing was a big factor and it sounds like the welds on them were suspect too. The main beams weren't tied to each other strong enough to carry the weight over 100's or thousands of cycles. The concrete tied to the studs was supposed to add some structural strength. Poor workmanship, poor engineering, poor quality control and poor inspection caused the failure. Politicians pushing for it to be open by a certain date sure didn't help.We had a bridge here a few years ago fail while under construction because the contractor installing it got in a hurry. The huge girders (40 tons) buckled and had to be removed to get straightened. The contractor tried to take a short cut and the cross bracing failed which caused the girders to buckle. I don't know why they don't specify heavier cross member support considering it's a bridge and the extra weight wouldn't make a big difference. Would have been cool to see how the huge girders were straightened. The contractor paid dearly for their mistake though. The largest rubber tire crane in the area(1200 tonne Liebherr LTM11200-9.1) had to be brought in to stabilize the structure while the beams were removed and that in itself was a major accomplishment. https://www.news957.com/2015/07/20/n...n-bridge-city/https://canada.constructconnect.com/...onton-1007773whttps://cranenetworknews.com/ncsg-br...k-in-edmonton/Last edited by Welder Dave; 06-13-2021 at 07:23 PM.
Reply:Here's a pic from the NYT piece showing the welds.Their link does not require a sub but their web design is mongtardedly stupid.
Attached Images Last edited by farmall; 06-13-2021 at 08:42 PM.
Reply:Once you read some mysterious number of articles in a month(I think) they will ask you to subscribe.---Meltedmetal
Reply:
Originally Posted by Meltedmetal
Once you read some mysterious number of articles in a month(I think) they will ask you to subscribe.
Reply:[QUOTE=Welder Dave;8816733]T Would have been cool to see how the huge girders were straightened. probabaly not near the severity ur talkin about, but w/ this and the talk of trucks hitting bridges - figured id post it. https://weldingweb.com/vbb/threads/4...=bridge+impact
Reply:Reading one of the articles it says sometimes the beams will go back straight on their own as long as the deflection isn't too much. Heat straightening is an art. Like in the old post above, having the right people is the key.
发表于 2021-9-1 23:18:03
