Lincoln Electric 205-TAC/DCTIG Steel TIG Welding, Copper TIG Welding, Tips for AC TIG Welding

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B-9

OPERATION

B-9

 

 

 

STEEL TIG WELDING

The TIG process is very effective for welding both car- bon steel and alloy steel, especially in applications requiring precision results. DC Electrode Negative Polarity is required. Since this process does not include the removal of impurities, proper cleaning and preparation of the edges is required.

FILLER MATERIAL:

The filler rods must deposit welds with mechanical characteristics appropriate for the application.

COPPER TIG WELDING

Since TIG welding is a process characterized by high heat concentration, it is particularly suitable for weld- ing materials with high thermal conductivity, like cop- per. As with steel, the DC Electrode Negative Polarity is employed, with argon as protective gas.

Considering the fluidity of molten copper, the use of backup support may prove useful.

FILLER MATERIAL:

In order to avoid the oxidation of the molten material, filler materials containing phosphorus, silicon or other deoxidating materials are typically used. The mechan- ical properties can also be improved through the use of silver.

TIPS FOR AC TIG WELDING

(AC/DC model only)

AC Inverter TIG power sources offer two significant advantages over conventional Silicon Controlled Rectifier (SCR) / transformer power sources:

1.The AC wave balance can be set to a higher per- centage electrode negative which minimizes tung- sten heating and erosion.

2.The AC frequency can be varied to "focus" the arc. Increasing the AC frequency above 60Hz will nar- row the cone shape arc from the tungstenʼs tip. Decreasing the AC frequency below 60Hz will broaden the cone shape arc from the tungstenʼs tip.

The two above benefits can be used to maintain a tight focus of the arc for precise heat control and tight joint access. Because of the AC inverters abilities in these areas the following recommendations are made as a starting point:

A 2% Thoriated tungsten is recommended instead of the Pure tungsten that is normally recommended for AC welding. Thoriated tungstens emit electrons easier and therefore will improve starting.

Sharpen the tungsten to a point. Normally it is rec- ommended to pre-ball a pure tungsten when AC welding with a conventional power source. However, the AC inverter with itʼs extended AC bal- ance control minimized tungsten heating thus allow- ing for a pointed tungsten to be used.

Set the AC Balance control to maximum 85% elec- trode negative. This can be reduced if the material welded is heavily oxidized, however starting at max- imum and adjusting to less is desired.

Set the AC Frequency in the 100 to 120 Hz range. This is a "Sweet Spot" for most aluminum applica- tions.

GTAW Process

Electrode Polarity

DC-

AC

 

Approximate Argon

 

Electrode Tip Preparation

Sharpened

Sharpened

 

Gas Flow Rate

 

 

 

 

 

 

 

 

C.F.H. (l/min.)

 

Electrode Type

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EWTh-2, EWLa-1

EWTh-2, EWLa-1

 

 

 

Stainless

 

 

 

 

 

 

Electrode Size-in. (mm)

 

 

 

 

Aluminum

Steel

.010

(0.25)

 

Up to 15 A.

Up to 15 A.

 

3-8

(2-4)

3-8

(2-4)

.020

(0.50)

 

Up to 15 A.

Up to 20 A.

 

5-10

(3-5)

5-10

(3-5)

.040

(1.0)

 

Up to 80 A.

Up to 60 A.

 

5-10

(3-5)

5-10

(3-5)

1/16

(1.6)

 

Up to 150 A.

Up to 130 A.

 

5-10

(3-5)

9-13 (4-6)

3/32

(2.4)

 

Up to MAX. A.

Up to MAX. A.

 

13-17 (6-8)

11-15 (5-7)

1/8

(3.2)

 

X

X

 

15-23

(7-11)

11-15

(5-7)

Tungsten electrodes are classified as follows by the American Welding Society (AWS): +2% Thoria .......................EWTh-2...red

+1.5% Lanthana ...............EWLa-1 ...black

V205-T DC & V205-T AC/DC TIG

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Contents Invertec V205-T DC & V205-T AC/DC TIG April Safety California Proposition 65 WarningsElectric Shock can kill Welding and Cutting Sparks can Cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a LʼArcV205-T DC & V205-T AC/DC TIG Safety Thank You Table of Contents Installation Operating Temperature RangeStorage Temperature Range Select Suitable Location StackingTilting Environmental AreaReconnect Procedure Input ConnectionsTable A.1 Nominal RangeAttachment Plug Installation 230V Input115V Input Engine Driven GeneratorOutput and GAS Connection for TIG Welding Figure A.1 Output Connection for Stick Welding Figure A.2Work Cable Connection Remote Control Connection Shielding GAS ConnectionSafety Instructions OperationGeneral Description Welding CapabilityRear Control Panel Figure B.1 Figure B.1Controls and Settings Figure B.2Step Diagram TIG DC SET UP Menu Indicator Parameter DefaultOutput Limitations Welding PolarityPulsed TIG Alternating Current AC/DC model onlySteel TIG Welding Copper TIG WeldingTips for AC TIG Welding Filler MaterialTips for Improved TIG Starting Protective GASAC TIG Welding Quick Start UP AC TIGDC TIG Welding Quick Start UP Accessories Optional AccessoriesCompatible Equipment Cable PlugsMaintenance Safety PrecautionsInput Filter Capacitor Discharge Procedure Routine MaintenanceTroubleshooting HOW to USE Troubleshooting GuideTroubleshooting Problems TIG Welding Field Service FacilityYour local Lincoln Authorized Failures DisplayWiring Diagrams V205-T DC Wiring Diagram forV205-T AC/DC Wiring Diagram for V205-T DC & V205-T AC/DC TIG V205-T DC & V205-T AC/DC TIG Precaucion Warnung