Thanks @mtt.tr - I have access to a clamp meter, but it's used for verifying return current on welders. Note sure if it's suitable for mA range but will soon find out. What you suggest would possibly narrow down which appliance is leaking to earth - is that right?
Thanks, Michael
Thanks very much @sparkysy for that comprehensive reply! Right enough, there is a fridge on one of the circuits. And yes, having all those circuits on the one RCCB is a nuisance for sure. I don't have any testing kit myself, but it sounds as if I should get a local spark in to follow up. I...
An appeal to the sparks onboard...
The Crabtree RCCB in our consumer unit which serves the outbuildings and septic tank aerator pump is tripping, apparently randomly, and possibly spuriously. Details/diagnostics so far:
House built in 2007, CU and RCB are originals from then.
Weeks or months...
Hi @Kieran352
If it’s anything connected to the vent/blowdown system, it’s almost certainly an SCE (safety critical element) and there will absolutely be some engineering input, including definition of the welds and a detailed WPS. Worth checking on that before anything else.
Good luck,
Michael
A classic approach is to use 7016 for the root pass, with Filarc 56S being a widely used rod. Thereafter, perhaps a hot pass with the same rod, before moving onto a 7018, with ESAB 48.00 being a suitable candidate.
Depending on where you are in the world, Kobelco LB52U 7016 are highly regarded...
I did chuckle @Rokweld !
Maybe when work eases off a bit. Joking aside, I do have Böhler and Elga in stock, so maybe a wee comparison would be in order?
The INE 46 blue 6013 are very nice to use. They’re very good value also. But I think it’s fair to say that caution is needed regarding penetration…
https://www.mig-welding.co.uk/forum/threads/penetration-fusion-part-2a.105180/
I’m a humble solid mechanics wrangler, but have worked for years with those very clever fluids gurus, grappling with flow problems. Does look like classic aeroelastic flutter, so your instincts were absolutely correct.
JPL… indeed. This class of problem is really compute intensive.
Another...
Hmmm… seeing the video, it’s more like vortex shedding/flutter at higher flow rate. Add the Blutack and see if you can dampen it.
As to your temptingly exotic suggestion of adding spoilers or strakes… the agricultural approach would be to take the snips to the trailing edges and cut/twist loads...
Not at all an aeroelastics expert, but you’re right to suggest added mass. Often the handiest way to alter modal response and eigenvalues.
It’s possible your change to stainless increased stiffness, so adding mass might get you back into a less responsive interval between modes.
I'm loath to comment really, but speaking as someone from NI, it's important to note that many folk here anticipated the very delicately poised situation here would, inevitably, be destabilised by the outworking of the 2016 vote. Whilst the majority of voters here expressed a preference to...
I have pulse MMA on the TP180, but have only ever footered about with it. What I’ve found is that it clashes with the way you’d normally manipulate the rod. You have to overcome muscle memory. As noted above, it feels like something included as a byproduct of the nice inverter electronics, but...
There's a wee summary table here which sets out the full comparison: https://www.fronius.com/~/downloads/Perfect%20Welding/Brochures/PW_BRO_TransPocket_150_180_EN.pdf
This is a very good point. And underscores the difference in something like a Transpocket which is a “pure bred” MMA power source. It provides for TIG use too, but it’s secondary really.
So if your focus is on MMA and the widest scope of electrodes, go with a dedicated MMA unit, I’d say.
I’m biased, somewhat, as I own a Fronius TP180. But it’s very hard to find anything negative about it. Costly initially, but then over its lifetime...
Any of those other makes, are likely to provide much the same quality and long term value.
Probably all those factors, to varying degrees. I’ve used inverters at both ends of the spectrum. There’s no doubt that the premium machines make life easier. In fairness, an experienced and skilled person can do a good job regardless.
Personally, I find the high OCV and stability of the TP180...