Hello weldstudent, I'm probably going to start a firestorm here, but what the heck, I've done it before. WABO doesn't "officially" have WPS's for their weld testing, there, I said it. I do a considerable amount of testing for WABO and I'm on the opposite end of what you stated in this post. When I administer SMAW WABO's, or for that matter any of the other processes recognized and covered, I stipulate stringers. I do not force welders to come to me to test for WABO, if they disagree with my procedures or train of thought, they have the freedom to test elsewhere. My logic and insistence mainly has to do with operator skill and assuring that the welder has it. I do believe that stringers require more operator skill to be proficient in, so in the cases where stringers are stipulated in the work setting there are fewer questions as to the welders abilities to perform. Additionally, I do believe that moment connections for seismic applications in structural steel specify stringers or a description of bead widths/sizes that probably would not fall into a weave type of category, here again the terms can certainly be interpreted from many different perspectives or definitions.
The stringers/weaves issue has been debated to the point of delirium on this forum and likely many others. Most codes are rather vague on what they consider maximums for bead widths, some speak of width vs. rod diameter, some refer to depth/thickness or depth/width ratios of deposited weld metal, some discuss solidified slag in relation to the weld puddle or a lack of it, there are any number of statements or definitions to describe these variables. I believe materials/alloys have a great impact on being a variable, material science can certainly dictate the effects of heat input due to bead sizing or deposition with relation to time at temperature, travel speed, and other things that can impact the metallurgy of a sound and serviceable weld.
The bottom line to my response in the first place is to indicate that there are situations, allowances, requirements, needs, for both forms of bead applications(stringers, weaves) and you should be capable of performing both of them equally as well. Also, do not hesitate to ask whomever you are doing work for, which particular method they are expecting or requiring you to use or be proficient with. You will be working with WPS's on some if not all of the work that you end up doing in the future and should be able to handle this as the situations arise. That's my $.02 on the subject, good luck, congratulations on your new employment, and best regards, Allan
Excellent explanation Allen.
I don't think you started a firestorm at all IMHO... Just a well laid out and concise explanation with respect to the reasons why you and other folks require stringers as well as why most companies do also with respect to achieving certain specific metallurgical requirements and finally, the importance of being proficient in depositing both techniques as well as inquiring about the type of technique required prior to testing or producing...
In other words, It's a pretty much straightforward explanation my friend.
Respectfully,
Henry
Thanks Henry, and it's good to see you so actively involved in the forum these days, I have not been very active as of late. The OP is fortunate to have landed his present opportunity and should certainly be able to pursue and carry on from this point to a very successful future in the trade. It sounds like he is very intuitive and will be able to observe, learn, and understand the many different opportunities and challenges that lie ahead of him. Again Henry, great to be hearing from you and look forward to reading so much more of your replies and observations. Best regards, Allan
Good to see both you guys more active again.
Hope all is going well for both of you.
I won't bother to add more to the line of this thread as I think Allen did a fine job. There are usually reasons behind the majority of restriction/requirements made while testing. Yes, some are simply at the 'whim' of some inspector or employer, but USUALLY there are reasons.
Have a Great Day, Brent
By weldstudent
Date 07-03-2011 17:00
Edited 07-03-2011 17:02
Allen,
Thanks for the info, as stated I am still new to the trade, and all I know is what I’ve learned thus far, I have learned a lot, but I still don’t know jack, (not disrespecting my teacher, I learned a lot from him but he can’t teach everything), I will catch on quickly to any techniques new to me. I am very inquisitive and when I don’t know I need to ask, hence my handle. Even though I’m done with school I am never going to be done learning, I will always be a student, even when I’m teaching others.
Thanks to everyone for the information.
-Levi
By Blaster
Date 07-03-2011 19:14
Edited 07-03-2011 19:57
Hi Allan
For our WABO testing we use the various predone WPSs you can buy from the AWS. None of the ones we use for testing have any limitations on bead width, only bead thickness. I don't specify weave or stringer, but I do limit the bead width at 1".
I don't require it, but I encourange and like to see the guys use 5/32" electrodes for SMAW on 1" plate tests. We test on 8" long plates and the welders have 4 1/2 hours to do two plates.
Hi Allan
We do our 5G and 6G FCAW structural pipe welds without a weave. We also do our 3G structural welds with T-8 wires without a weave, but I would be amazed if an outfit doing the same joints with the SMAW process instead of FCAW could stay in business!