No need for the pulse imo.
You’d get with a walk without the wash over.
It’s quite thick section by the looks of it. Certainly not the way I’d weld the manifold in pic 1.
Yes mate couldn’t tell you the flow rate , just enough to keep positive neutral pressure in the pipe. And purged plenty long enough never had the use of a sniffer .
I do a bit of purging on stainless mate.
I do 4 lpm to fill the part at least 4 times over. (Calc rough volume of part then fill it with argon at least over 4 full cycles).
After this I drop my purge rate to 2 lpm and keep it at this throughout the job.
ive got to get more hours on the stainless the last 2 welds i done were rough , set up was done by the customer had gaps and pipe was 2 different sizes , grim is the word i would use !
ive got to get more hours on the stainless the last 2 welds i done were rough , set up was done by the customer had gaps and pipe was 2 different sizes , grim is the word i would use !
big gaps ,no gaps bore mismatch ,ovality
bad acess all part of a normal day for me
on what is called golden butts ie final tie in welds .
we use high lpm purges argon or argon nitrogen mix and vent off. as required ,tying the root in its reduced enough so your not fighting it .every time the grinder is used we tape the joint up and check the purge with a sniffer to make sure theres no air in it
purge is maintained at around 20lpm till weld is cool to prevent discoulouration of root and haz we have a vent to the open side of line to prevent pressure build up
costly for argon but cheaper than chopping and rewelds due to skimping on purge
for smaller stuff tape up the joints rig up a plastic 2 way valve pull a vacuum with an old hoover then open the valve to fill with argon
purge will be perfect instantly
I watched a docu on RR last night and there was a gut tig welding titanium turbine blades to a hoop on a big trent engine and they looked quite rough in comparison.