What are the possible issues with quenching the material in water after welding? We typically dip the parts in a bucket of water after welding (yes, still hot). Im told that this is to stop " carbide precipitation", however, I don't really know enough about metallurgy to say any different. I...
Stan,
Yes I have. We actually weld in that position (infrequently) for longer parts, so I have a spare positioner I will use for testing these new parameters. I am trying to find a device(torch holder)that has a wheel that rests (or rolls) on the tubing as the part turns,allowing us to set the...
Anyone out there doing this on a daily basis? If so, could you suggest a IPM for welding T316L tubing? I think that our speed (ipm) is too slow, and (according to the parameters we use) varies depending on the diameter of tube. Im thinking that the ipm should be consistent for all diameters of...
I agree that I could have more control with orbital, and that my current process has limitations. I guess we will continue to observe and refine the current process while we wait for the chemical test results to come back. It may well be that we have to tolerate this issue if we decide to...
You are talkig about an orbital welder. Yes, we have looked at those, but they have their limitations for our kind of work. Not to mention that they run about 30-40K.
Also, the tube or pipe is in the vertical position with the TIG torch horizontal. We are using Hydrastar (5% hydrogen) sheilding gas on the welding side. The material is .035" to .120" wall thickness.
The process is Autogenous welding, fusing two sections of tubing or pipe together with no filler rod. The parts are tacked together, then placed into a positioner. Sheilding gas is introduced inside the tube or pipe to purge the backside of the material, and the tube or pipe is TIG welded in one...
I am looking to test some SS tubing to determine the sulfur and other elemental component levels. We are experiencing some issues with consistent penetration in our welds, and it seems to be primarily confined to a certain batch of tubing. Although I have test reports for the material stating...
NO chemicals, cleaners, etc. at the weld operation. I am sure it is possible at the molder, although they are firm in their insistence that this is not possible.
Thanks again for the advice.
As you can tell, I am not a polymer guy, and I really appreciate the help form you experts.
The welding supplier was not much help. I attended one of their training sessions where I met many other people with the exact same problem. The welding suppliers response to polymer questions was "try...
Pat,
The previous material was Entec Hylon (basically carpet scraps). It was 33% glass filled nylon 6/6.I went thru the whole process of drying, etc.. but the variation of the materials was just too great to get any consistent results. The change to Dupont was extermely benificial, as the burst...
Weld area does not appear to affect the leaking. I have welded parts at different depths to check this theory, but the results were unchanged. With the previous material the weld depth had to be maximized to get the strength, but with the Zytel, minimum welds result in acceptable strength. The...
Moisture issue has been tested ad nausem. I actually have a commercial dryer in-house on loan from the maker. We weld the parts as soon as they arrive from the molder (usually within 2-3 days of molding). the parts are shipped in sealed bags with dessicant. I have tested the leaking batches...
I am currently trying to establish the root cause of some leakage problems that we are experiencing with welded plastic components. I have been working on this part for the last year, and am really at a stand still now. The part is a small canister (approx. 3" diameter)that must not leak after...
Thanks guys.
I will be purchasing a moisture analyzer to test these parts prior to welding. We have not had any trouble thru the winter month, however, now that it is 100F + degrees, and high humidity, our problems are huge. The sound of the parts is definitely "dull". I would like to have a...
Hi all. I am interested in drying parts made of Nylon 66 (33%glass)prior to ultrasonic welding. I have a problem with moiture uptake in these parts, as they tend to sit around a while before welding. They are shipped from our molder in ziploc bags with desicant bags, but they still seem to take...
Is it possible to braze nickel plated carbon steel to 304 satinless using copper as the filler material? This part would be brazed in a belt type brazing furnace with hydrogen atmosphere. My guess is that the plating will be degraded,and we has offered to the customer to use 304 SS on both...
This particular part has a shear joint also. I have dried parts prior to welding,according to my molders suggestions, and the average burst pressure actually dropped compared to parts dried by another process. We definitely have some problems filling the mold the way we would like, and we are...
Thanks pat for the response. They are all failing at the weld joint. I have been able to burst the body of the part when the weld is optimal. I do have more info. now. The welding guys say not to go over 20% glass fill for welding this kind of part, however, I have had very good luck with this...
