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I'm going to go over ten of the so-called overlooked provisions we'll probably be doing three and four in the three segments of this webinar the extent of coverage is not identical for all ten number one the engineer shall determine the suitability of all joint details to be used in a welded structure the engineer shall determine the suitability of all joint details to be used in a welded structure where you ask do I find at that provision well it's in clause 1 point 4 point 1 of D 1 point 1 now for your benefit anytime I have a slide that has the format that I'm showing you this is an exact quotation out of the structural welding code and highlighted in yellow we see the words that are essentially the first principle the engineer shall determine the suitability of all joint details to be used in a welded structure I assume everyone is familiar with the so-called pre-qualified joint details you find these in D 1.1 you also find them in your steel manual far too often engineers assume that if pre-qualified joint details are employed there is no obligation on their part to evaluate the suitability of those joints and even a more dangerous assumption is that all pre-qualified joint details are somehow foolproof and suitable for every single application this is not the case, and I'd like to try to explain why that's the situation we can also read these words in the code the pre-qualified during details have repeatedly demonstrated their adequacy in providing the conditions and clearances necessary for depositing and fusing sound weld metal to base metal and that's true it goes on to say this however the use of these details shall not be interpreted as implying consideration of the effects of welding processes on base metal beyond the fusion boundary nor the suitability of the joint detail for a given application nor the suitability of the joint detail for a given application let's take an example and analyze it we're going to analyze it in terms of whether the joint is pre-qualified and then whether it's suitable for a given application what you see on the screen is known as a TC u for a G F joint detail it has a prescribed brutal pain R and a prescribed included angle alpha the material shown in the light blue is thickness t1 and in gray thickness t2 let's now add on some dimensions that might be applied to a given project for starters I want to look at a quarter edged root opening a quarter 45-degree included angle the purple material is an inch and a half and the joint material is a half inch thick the first question is the joint details pre-qualify now to answer that we'll go to the code or to the steel manual, and we identify the critical variables that constitute prequalification expanding that slide for just a moment we see that we have a root opening and the root opening in our joint that we just looked at with a quarter inch and that's pre-qualified the included angle was 45 degrees, so that's pre-qualified t1 can be unlimited in thickness,...
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