military doesnt like weave patterns?

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a buddy of mine got a job before school started. i guess they do military work. during the weld test ( mig, t joint) he used a j pattern that gives you a nice "stacked look". anyway, they told him the military doesnt like weave patterns, so he had to run stringers. anyone know this reasoning? do stringers give you more penetration?
Reply:Tensile test--cooling rate--position--heat input, blah; blah; blahStringers are strongerSome people run stringers with a "small" weave. They say as long as the weave isn't greater than twice the diameter of the rod, that you are still in good tolerances.The state CWI that give us our D1.1 test at the hall, only allows stringers.But what do I know. There should be a few CWI's on here that can give a better description.Semper FiJesus may have been a Carpenter, but his dad was a Millwright" A grinder and a can of paint, will make a welder what he aint' "I've done so much, with so little, for so long, that now I can do anything with nothing!
Reply:A mate of mine was doing a welding course to become a boilermaker. He was talking to the instructor about the appearance of welds and my friend walked away after having learnt that the "stack of dimes" look is absolutely frowned upon by the manufacturing industry.He was told that a nice smooth continous weld is what the aim should be.
Reply:Originally Posted by skelley521Tensile test--cooling rate--position--heat input, blah; blah; blahStringers are strongerSome people run stringers with a "small" weave. They say as long as the weave isn't greater than twice the diameter of the rod, that you are still in good tolerances.
Reply:It depends on the WPS, but in the power industry stringers are the standard.
Reply:Best advice I can give, is be able to run both. If they want weaves, give them weaves. Same goes for stringers. Just gotta find out what the inspector/cwi/boss man expects and be able to deliver.
Reply:Originally Posted by jpmillera buddy of mine got a job before school started. i guess they do military work. during the weld test ( mig, t joint) he used a j pattern that gives you a nice "stacked look". anyway, they told him the military doesnt like weave patterns, so he had to run stringers. anyone know this reasoning? do stringers give you more penetration?
Reply:Back when I was in the USAF we ran stringers "because I told you to" and so that's what we did.Two turn tables and a microphone.
Reply:Originally Posted by LlundbergA mate of mine was doing a welding course to become a boilermaker. He was talking to the instructor about the appearance of welds and my friend walked away after having learnt that the "stack of dimes" look is absolutely frowned upon by the manufacturing industry.He was told that a nice smooth continous weld is what the aim should be.
Reply:so stringers are the best way to go in industry. i wounder why my instuctor is teaching us weave patterns. ill have to ask him.stick welding, i know you should only run stringers on 1f and 2f. inless its 6010, then you do the "whip and pause". 3f you weave, depending on which rod your using. 7014 is an inverted u for 1st pass, 2nd pass is a z weave. is this true in industry also. (note: i know differnt welders use different patters for vertical 7014)
Reply:my mistake 7018
Reply:Every weld test I've taken ( 3G; 4G & 6G) were either open butt or backup strip.The CWI will tell you what is allowed per code of the test given.I've always been told, 7018 = stringers only; 6010 = drag or whip/pause, your choice as long as the root is flush to 1/8" high on the backside of the open butt.There is nothing wrong with learning different methods of rod manipulation, you have to do it sometimes out in the field.However, if it's a critical weld, the CWI has to VT each stage of the repair and do a final either dye pen. test or X-ray, he may reject any manipulation and have you grind it out.Semper FiJesus may have been a Carpenter, but his dad was a Millwright" A grinder and a can of paint, will make a welder what he aint' "I've done so much, with so little, for so long, that now I can do anything with nothing!
Reply:7018 & 6010 are the standard in the industry and most of the time they are the only stick electrodes available for mild steel to mild steel.They do give you a choice of sizes: 3/32", 1/8" & 5/32, that's it, so get good with them Edit: Most of those other funky number rods are considered by the industry to be for home/hobby use on mild steel.However, I feel they have a purpose as far as matching the material to be welded and such.In the end, the CWI will state what rod you end up using.20+ years in Industrial Maintenance, mild steel to mild steel, I have only been allowed/offered 6010 & 7018.Depending on WPS I have also used 9018 & 10018, but still it's xx18.Edit 2: It's also standard to use Direct Current Electrode Positive (DCEP). Also called direct current, reverse polarity (DCRP).Last edited by skelley521; 09-11-2011 at 12:50 PM.Semper FiJesus may have been a Carpenter, but his dad was a Millwright" A grinder and a can of paint, will make a welder what he aint' "I've done so much, with so little, for so long, that now I can do anything with nothing!
Reply:Seeing as I am working for the Navy indirectly I can tell you that no weaving just oscillation, no concavity and marginal convexity and weld size can be no larger than the next gauge size above the stated size of the weld.  That being said some allowances are made on non critical weldmonts but they are not big allowances and every bead is inspected first by the welder then his supervisor then add in more supervisors and ascending level weld inspectors.  The area's around the welds are inspected and there's all sorts of testing thats done and other criteria that I won't mention.Welding Supervisor Department of Corrections.
Reply:Originally Posted by LlundbergA mate of mine was doing a welding course to become a boilermaker. He was talking to the instructor about the appearance of welds and my friend walked away after having learnt that the "stack of dimes" look is absolutely frowned upon by the manufacturing industry.He was told that a nice smooth continous weld is what the aim should be.
Reply:Foot pedal? High Freq? Balance Control?That's how I get after work...Put the foot pedal down, arrive @ bar and say "Hi Freaks" get drunk and loose balance control....lolI've always used scratch start, it's just the way I was taught.Semper FiJesus may have been a Carpenter, but his dad was a Millwright" A grinder and a can of paint, will make a welder what he aint' "I've done so much, with so little, for so long, that now I can do anything with nothing!
Reply:Originally Posted by tenpinsevery electrode has a description, given by the manufacturer, of how the bead should look. Hobby weldors like the stack of dimes things because they think it looks cool, and is strong enough for what we do.  Being able to comply with these kind of process requirements is the difference between real weldors, and people who mess around with welding equipment.
Reply:There are two primary reasons why they favor the stringers over weave beads - first being that stringers are less susceptible to cold lap and slag inclusion type discontinuities, and the second is that the stringer beads result in a reduction in heat input, which typically results in improved impact performance.  This is more prevalent in military procedures involving higher alloy steels, and consequently, higher impact requirements.
Reply:Supe nailed it right on. Heat input is the reason for stringer. You create less stress in the weld zone with stringer.