[PSUBS-MAILIST] bend test

[hank pronk via Personal_Submersibles]

 Rick,No, I am having trouble finding exact details.  I did find that for the yield strength it must be bent over a 1.5 inch mandrel.  Also if the piece is being bent sideways it must be full thickness but no detail on width.  Also if the sample is flame cut the HAZ must be ground off and I did that.  If the sample is sheered off then the work hardened surface must be ground off.  I want to cut the next sample with a band saw to ensure the flame cut has no effect.  I did not bend it completely into a U shape because the guide bars are set for 1 inch by 1 inch sample.  I am going to make a video of the next bend that will show the weld area being bent sideways and I will set the rig up to ensure it bends it completely into a U shape.  As you can imagine I am delighted with the results so far, and realize that I have to  make an adjustment to create the perfect U shape.  That will be easily done.Hank
    On Friday, September 22, 2017, 6:20:49 PM MDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank Did you look up all the spacifics the labs do for that spacific type of test and replicate it? Rick 
On Fri, Sep 22, 2017 at 5:03 PM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,I tried sending pictures of my bend test from my Elementary 3000 sample.  I was rather confused and thought I may have not bent it sideways but in fact I was right the first time and it is bent sideways.  I cut my sample into a square so it will clamp into a band saw.  I took a piece off the side and cut it 3\4 inches wide, so the sample is 2\4 by 1 inch thick.  I bent it over a 1.5 inch mandrel and there is no cracking at all.  There is a wierd thing though,  before the bend you could not see where the weld was but after the bend you could see a slightly raised area where the weld met the parent metal.  I filed that tine bump smooth and there is no cracking or anything.  Wierd.HankI will send a picture separately Hank_______________________________________________
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