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[dave powelson]

Wipe down with acetone, then light grinding/heavy sanding of scale to prep the weld area is quicker/cheaper/faster than having to deal with porosity, etc.--after welding. Mill scale comes in a wide variety of types/thickness and contaminants--as you've surmised.
Often one can 'get away' with no...

[dave powelson]

...ummhh...how about checking the boom material actually used--with mfg., etc.?
It's not unusual that HSLA steels or higher strength steels are used in boom construction....

[dave powelson]

Every structure flexes. Presumably this trailer is over 40' in length. 3/8" flex in 40' ain't much.
When structures don't flex or are stiffen to prevent flex (with no fore thought or understanding
of the dynamics of structure loading)....that creates more cracking, bending, permanent...

[dave powelson]

When a TIG machine breaks down that I need for my shop work, I take it 45 miles to an established repair shop
that is factory authorized for miller, lincoln, TD, Esab, etc. They've got the experience, knowledge, skills and parts
to either fix it or tell me to get another unit. Either way,...

[dave powelson]

The purpose of the drawing is to specifically communicate the design intent to the 'doers'.
To avoid confusion among the troops, stating the process or selection of processes that are acceptable is wholly appropriate.
Drawings are supposed to answer problems and questions---not raise more...

[dave powelson]

Ditto the above.
Cleaning, swabbing the tube ID's prior to welding to eliminate oil inside, is a kinda, must do, additionally.
Takes a minute or two to do, which is significantly less than dealing with oil created pressure/porosity problems after the fact....

[dave powelson]

The more detail you can reveal in your question, the better the answers that you receive will be.
Pics you post can really help.
Tower?..as in tuna tower? radio tower? what kind of tower?
...repairing the tower ...becuz?? it broke...becuz...??
material of parent tower?...

[dave powelson]

With the a/c line off vehicle, flush the residual oil inside out with acetone, etc., blow it out dry-first....

[dave powelson]

1-I agree that miller should give u the data you're seeking. The other reality being that nobody's arc start is carved in stone,
and the user can and should tailor it to his liking. The factory presets based on electrode size are simply to let anybody get an arc start.
Miller designs and...

[dave powelson]

waste tank vacuum pump?



Failed coatings and mis. tank debris, including corrosion chunks of the tank wall can't get thru the baffling and filtration system.

The vacuum pump is a indu$trial, CI, engine driven, lobed, $upercharger. The vacuum inlet at the tank...

[dave powelson]

build al carpet clean waste tank



By chance is this a Hydramaster tank?
Those sell--if available, for something like $3500++

The tank also functions as a vacuum reservoir. The top tank edge needs to be flat and flush, to seal against the inside of the top,...

[dave powelson]

AL carpet cleaning waste tanks



For forming, 5000 series is easier, I think 6063 may be more corrosion resistant,
but the material selection isn't as important as what follows:

I've modified new, used and rebuilt these things. The contaminants from the...

[dave powelson]

let others do your search work!

amphenol plug pin tool

Above link yields a variety of results.

[dave powelson]

search terms are important



Search using the term Polymet RENE 142 PMet 842 link below:

https://duckduckgo.com/?q=Polymet+RE...Met+842&t=ffcm

yields a plethora of results. DuckDuckgo doesn't track you....

[dave powelson]

Hacking cracked flat spots on AL rims

Flat spots on rims, especially if low profile tires are mounted, can suddenly
loose pressure, resulting in loss of control. Heating and beating out
a flat spot only induces more internal stress and cracking.
This flat may also affect...