Why is High Frequency Set to Continuously for Ac Welding

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High frequency contiuous? or only to start?

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Senior Member

Join Date: Mar 2009

Posts: 143
High frequency contiuous? or only to start?

05-08-2009, 03:16 PM

Reading the book it lists A/C HIGH Freuency..on my machine i have a setting for HF to start, HF off, or HF continuous

should i be welding aluminum on HF continuous???

I think my machine has been on HF start for a long time

bob
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Join Date: Feb 2009

Posts: 265
Yeah, should be on continuous for tig welding aluminum

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Senior Member

Join Date: Feb 2009

Posts: 202
put it on start for DC welding with Tig

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Senior Member

Join Date: Mar 2007

Posts: 2219
Depends on the machine.

Transformer machines require HF Continuous for AC welding of aluminum.

Inverters (Dynasty Series) use HF to start the arc only. The machines make the transition from DC+ to DC- so rapidly, they do not need the HF to maintain the arc as it passes thru the 0 state.

Syncrowave 250 DX Tigrunner
Dynasty 200 DX
Miller XMT 304 w/714D Feeder & Optima Control
Miller MM 251 w/Q300 & 30A SG
Hobart HH187
Dialarc 250 AC/DC
Hypertherm PM 600 & 1250
Wilton 7"x12" bandsaw
PC Dry Cut Saw, Dewalt Chop Saw
Milwaukee 8" Metal Cut Saw, Milwaukee Portaband.
Thermco and Smith (2) Gas Mixers
More grinders than hands

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Senior Member

Join Date: Feb 2009

Posts: 265
Just wondering, do the inverter types like the dynasty have the HF switch for start-continuous-off? or is it just programmed into it

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Miller Trailblazer 302
Smith Torch Outfit
Lots of Grinders
Miller Elite Autodark Hood
O'l Trusty Jackson

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Senior Member

Join Date: May 2008

Posts: 1403
On an inverter welder such as the Dynasty 200 DX there is only HF for start (not continuous) for either AC or DC. For AC welding the square wave changes from positive to negative so fast that the arc doesn't extinguish or become unstable, so you don't need continuous HF for AC welding on an inverter type welder.

Smith Oxyacetylene Torch
Miller Dynasty 200DX
Lincoln SP-250 MIG Welder
Lincoln LE 31 MP
Lincoln 210 MP
Clausing/Colchester 15" Lathe
16" DoAll Saw
15" Drill Press
7" x 9" Swivel Head Horizontal Band Saw
20 Ton Arbor Press
Bridgeport

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Senior Member

Join Date: Feb 2009

Posts: 202
Reading the book it lists A/C HIGH Freuency..on my machine i have a setting for HF to start, HF off, or HF continuous

he is talking about a machine that has the switch

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Senior Member

Join Date: Mar 2007

Posts: 2219
Sure woulda been easier if the OP had just stated what machne he had questions about. Other than Lincoln and Miller, I have no idea what features other (even Chinese) machines have.

Syncrowave 250 DX Tigrunner
Dynasty 200 DX
Miller XMT 304 w/714D Feeder & Optima Control
Miller MM 251 w/Q300 & 30A SG
Hobart HH187
Dialarc 250 AC/DC
Hypertherm PM 600 & 1250
Wilton 7"x12" bandsaw
PC Dry Cut Saw, Dewalt Chop Saw
Milwaukee 8" Metal Cut Saw, Milwaukee Portaband.
Thermco and Smith (2) Gas Mixers
More grinders than hands

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Senior Member

Join Date: May 2007

Posts: 318
Originally posted by SundownIII View Post

Sure woulda been easier if the OP had just stated what machne he had questions about. Other than Lincoln and Miller, I have no idea what features other (even Chinese) machines have.

These chinese machine have the CRAP and POS feature. These chinese machines come feature filled.

Millermatic Passport Plus
Millermatic 200
Millermatic 350P with Python
XMT 304 /w S-64 feeder and 12VS
Dynasty 300 DX
Thermal Arc 400 MST
Victor O/A
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Senior Member

Join Date: Oct 2007

Posts: 2949
Hf...............(uhf, vhf, ufo?)

Originally posted by SundownIII View Post

Sure woulda been easier if the OP had just stated what machne he had questions about. Other than Lincoln and Miller, I have no idea what features other (even Chinese) machines have.

Yeah, Sundown, the questions are getting more vague by the post

Dave

"Bonne journe'e mes amis"

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