Stringers vs Weave...its a preference. Period. The A.W.S dosen't say one is or has to be done when taking the D1.1 or any other code. They are both welding techniques.And need to be applied where/when necessary.
On a vertical, run a weave. On anything else, run stringers. This is how it was origionally intended years ago, and still holds true now. No need to stringer a vertical unless you want to gring more than you weld. Simple as that. Anyone who says different has never used a weave on a test. I’ve never ran a stringer on a vertical, and have passed dozens, literally.
When I was doing my cert testing i trying doing caps with stringers and they were sticking far from the plates I switched to weaving and the difference it made was astonishing. I used mig for the process
Stingers are stronger. There are bend test videos on RU-vid proving this. Typically you’re not supposed to weave over a 5/16 weld. There are also videos of a cut an etch done on stringers vs weave. Stringers have a very fine grain whereas a weave has a very course porous grain. There are also less tie ins when running stringers which leave a more uniform looking weld and is also better for passing full penn welds where they UT or X-ray the weld. Weaving also puts more heat and distortion into what your welding. I’m not trying to hate on your comment but I see a lot of them where it seems like the person posting really doesn’t know much about welding. You also don’t need to “grind more” when running stringers. I don’t see any facts supporting why you said that other than “ that’s how it was originally intended”.
@@cakefartrpg2280 what is the name of your Metallurgy & Testing Lab? I’m a welding inspector for an oil & gas company and many of our procedures allow weave. They’re developed & tested to be proven just as strong for the applications they’re allowed to be utilized on.
The information and data I have seen that shows stringers are superior to weaves has to do with grain structure. When you weave you put way more heat into the weld which causes poorer grain structure. On charpy v notch and tensile strength tests there would be a predicted lowering of results using a weave vs stringers. How much of a lowering and if it’s enough to bust for rod spec is up for debate (and would require specific testing). However this is likely the reason so many high liability welds specify stringers only. Excessive heat input is never a good thing, and my understanding was the AWS deals with the weave vs stringer debate primarily with heat input limits. I am not a welding inspector nor a metallurgist but all of the evidence I have seen points to stringers being stronger due to grain structure. I know when I have cut and etched my own welds I have noticed a difference in grain structure with my own eyes between weaves/stringers, which tells me there has to be some validity to it. Anyway, great video 👍
I just passed an X-Ray test like this, on 1" thick plate , at 12" long , 1/8" 7018 Low-Hy. Rods , closed root, carbon arc back gouged on opposite side, fill pass,then capped. Fabrication for Oil Refineries and Power Plants. I did NOT weave on root pass, Slight manipulation for hot pass, weaved on most the fill passes, stringer beads on opposite sides of the plate for both caps. All preference and based upon W.P.S. at the end of the day
All of my tests never allowed weaving as a means of filling out the joint, some tests never even allowed a grinder beyond removing bridge tacks and if you reached for one they failed the test. I guess it depends on the company you are testing for.
Aws D1.1 structural steel code allows use of grinder on test. Aws D1.5 Bridge code does not allow use of grinders. The company does not determine what you can do, the code does, that is If a company AISC certified, if the company is not AISC certified they can do as they please.
@@trevorhoward6115 Excatly. I never seen a D1.1 state or city where power tools pneumatic tools cold chisels hack saw band saw blades of any kind are permitted. Always hand tools(ie chipping hammer wire brush) Was just wondering where you saw it at so I could have that info too.
@@davidswinson7260 My 2020 code book is at work, If I remember right it doesn't specifically say power tools or phonematic, pretty sure it uses the work "mechanical"
Remember, spastically with vertical you’ve got to keep on pushing pause on the walls fast in the middle . And I learned if you stretch the puddle it lays good and flat not humped in the middle.
AWESOME WORK. Love how you melted in 4 electrodes per pass. I now know that it taks time: across... press... up a hair... press... back across... press... up a hair and press.... repeat.... Saving this video for personal improvement. Thank you for the lesson, Sir!
I weld my stringer with about 1/2 rod width of oscillation anyway. It wets the sides into the previous bead and makes it look clean. Works on uphill too. Idk but it bends
True to many thoughs , I'v ran some stringers but my majority has been weave as well , union iron worker 20 yrs , passed all exams from NYC to booming out west and now run my own business . As long as you run tight on your ends keep a full puddle. vertical watch the shelf your good ,,, When you have full knowledge of what the rod is doing your good ..Like my favorite forman would say : what the hand crochets the mind motivates , ONCE AND DONE MOBILE WELDING , CC, FL
I’ve found that running stringers obviously gives more density so it helps for discontinuities(pipeline). I’d like to see a comparison between the Esab 90dh and the Bolher BVD90. The Lincoln rod I don’t know the name of but I’ve had bad luck with it.
Stringers are the deep penetrating versus weaving was taught that 36 years ago if you can run stringers you are a master welder weaving is much easier than stringers expierience is in the pudding guys if you can run stringers your hired
I also use 1/8"and 5/32 7018 low hydrogen 36 years exp.LA City Cert. Structural Steel great trade for all you young men that dont know what to do in life you will suceed if you want it and make great money this isnt a job its a CAREER good luck
stringers have less heat input, less stress on the heat affect zone . and as with all welds each pass refines the grain structure of the former pass. longer grain structure will crack more readily than a smaller more refined grain structure . hence too, a cap why put metal higher than the parent metal . Refine the grain structure of the weld the width of the parent metal ? this is what I was lead to believe
You'll struggle to get it exactly on the level of parent metal regardless of stringer or weave. If it's below the parent, it's a weak point, if it's above it should be stronger as there's more material.
Basically a weave is going to have more residual stress left in the weld when it cools. Stringers are more concentrated and the same amount of heat is applied over time. And it's easier to calculate the number of passes for a certain joints figuring stringers to figure out time and the amount of filler metal. Obviously stress relieving post welding helps but that's the basics. You're welcome.
I have spray arced several inch thick steel for the past 5 years at my current job. I have weaved EVERYTHING. Weaves as wide as 3 inches. I have never failed a UT. Weave is king! Stringers are cool, but you are creating more issues if you don’t put them in correctly. Any void or hump could be a highway for stress to travel. The criteria is more strict as well. Having to stagger tie-ins, back gouging every tie-in, measuring your peak to valley… just weave the damn thing.
I’ve done both weave and stringers on my d1.1 tests. I usually run nice slow stingers for my root pass, weaves to fill that gap, then stringers or weave for my cap depending on what the CWI prefers. I personally think the weave cap looks better than a stringer cap and so does most CWIs. Don’t be afraid to switch rod sizes too. If that gap is too small for your 1/8th switch to a 3/32 rod and turn it down 10-20 amps.
Just thanking about failure mods here. strikes me as a stringer might have more potential for little errors, but it will not fail catastrophically. a stringer, if it develops a crack from not really connecting with the next run for whatever reason, has the potential to fail catastrophically with a full on crack that runs the length. just a thought.
Everyone tries to make it all about the weld it self. The weld will be stronger than the base metal regardless. It's about your HAZ with weave vs. stringer. It's about carbon precipitation. Same reason to post heat and same reason to not quench. Your weld will be fine. It's the metal next to it that is in question. Think about what you are effecting not just what you are doing. Peace and stay safe Brothers and Sisters!!!
Its a pity he did not do impact testing of the weld metal, this is where the effects of heat input are seen best on mild steels, not so much bend testing. It is a bit like a cop saying you were speeding because you blew over the limit on a blood alcohol test. You are looking to achieve acicular ferrite, hopefully 50% plus by volume fraction in weld metal [in prior austenite grains as the weld cools], not course grained constituents like aligned ferrite and/or grain boundary ferrite or even fine pearlite, which is typically formed with high heat input welding, like what is found in welds suffering from excessive weaving. The property most likely to suffer is toughness through excessive amounts of the above nucleation and growth microstructures rather than bainitic type transformation products, so measure using a technique that will quantify those, not so much ductility by doing a bend test. An addition to impact testing that may also prove useful to understanding what the effects of weaving and excessive heat inputs are, would be a few comparison micrographs, to be able to compare microstructure achieved to fracture toughness. That is the real test, not so much a bend test in this situation - IMO.
Keep up your good work sir. I want to know if I can zigzag my bead when working on T-Joint horizontally on a 2.5mm plate thickness.please make a video on that for me.thank you.
Minutes 11.43, 2nd bending test Is it just me or the second sample bend with different speed? The angle is a little bit lower that the other sample. 1)speed is the same 2) the load is the same 3) different angle Maybe the second sample has a greater resistance to shear stress What do you think?
I was told from C.W.B inspector that he doesn't like to see more than two and a half rod diameters during a weave. It the weave gets too wide,then what your doing is running over slag and possibly getting inclusions. A big weave is no more than a build up pad.
It seems the conclusion is a good weave is usually good enough but stringers are stronger if you need to maximize the strength of the weld. Correct me if I'm wrong. But what about warpage? Does the weave and all its heat cause more warpage? I'm asking some of you pros out there I'm just a dauber.
Stringers have more weld integrity but they get old fast in the field on position welds especially in tight spots. They're time consuming and require more concentration to keep everything symmetrical. Sloppy crooked stringers are an eye sore and nothing to be proud about. Making smooth and consistent weaves is more satisfying because not everyone can master tie-ins and consistency. It's much faster to carry metal uphill than sideways.
Stringers are definitely better weaves put way to much heat on A36 you probably won't notice much of a difference but on high strength and alloy steels you for sure will
You should check out Jason Becker's video on this subject, where the standard tests are comparable, however when Charpy Vee's are done, Weaving is CLEARLY worse (Excessive heat input?) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--W1E0bxjcEc.html
When it comes to mig doing stringers is recommended, but in my job I do weaving to cover something up or I just do a 2 bead cap. Weaving makes your welds weak.
If you're not sure about your root, why are you challenging anybody to a weld quality test? Your root is the foundation of what you are trying to build......a solid weld.
What is the point of doing a stringer vs weave test, when you cap the weave test with stringers? Do another one weaved all the way out. I guarantee you they will both pass a bend test.
Just pause at the sides and not in the middle. Count pauses like "one thousand one ", then move across and count again. But don't allow your bead to be too wide and keep it tight. Like in a tight "Z".
Yo. On a bend test is fine, i'll pass but if they test it for tensile strength is lower, if the company you work for cares about heat input it's also a problem. Not that anyone cares...
Imo. For pipe, in position, The smaller rods Burn at the same speed if the amperage is set the same so it's up to clean up buffing and grinding on which is faster. But for thick plate, in position vertical up, you can burn 3/16 7018 , only using a weave, so I guess weave wins.
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Ok I’ll bite... Higher Heat input (but not too high) and/or a slow cooling rate = strong weld. Both stringers and weaves can be strong. Too small of stringers can result in poor grain refinement.
@@InchFab how is that? I have ran multiple PQR tests over the years and in multiple instances I have had my stringers fail mechanical testing due to poor grain refinement. I had this same conversation with another Welding Engineer before so we tested it the stringer coupon failed mechanical tests the weaving coupon passed. But I will agree that if all things (heat input and cooling rates are the same) stringers are just as strong but in my experience more often than not welders will have a lower heat input when welding stringers than weaving due to the increased travel speed. Weaving is a great way to reduce your travel speed and increase your heat input and thus increase your grain refinement.
@@4pingpro Stringers are alot more tricky to do because of the greater chance of slag inclusions due to too high of a bead ,undercut and improper cleaning. But once mastered it gives a lower heat affected zone and less stresses due to shrinkage and warpage.
