Lincoln Electric K2704-2, K2704-3 manual COUGARPush Pull Gun Operating Instructions, Making a Weld

Page 13

COUGAR™Push Pull Gun - OPERATING INSTRUCTIONS

Making A Weld

1Check that the push-pull gun power, control, and gas connec- tions are correct for the power source being used. Check that the gas supply is turned on. Check wire push-pull for an ade- quate supply of wire.

2.See "Procedure Settings", below for wire feed speed and voltage settings. Set these controls depending on the weld- ing wire and base metal thickness being used.

3.Connect work clamp to metal being welded. Work clamp must make good electrical contact to the workpiece. The workpiece must also be grounded as stated in "Arc Welding Safety Precautions".

4.Connect power to welder and turn "ON".

5.Prepare to purge gas line by first releasing wire drive. Push wire drive release lever to the UP position, to avoid feeding wire.

WARNING: Gun body and contact tip become electrically energized when gun trigger is pressed

and remain so for several seconds

after trigger is released.

6.Press and hold gun trigger for about 5 seconds to purge gas line. If adjustable regulator or metering valve is installed, adjust gas flow per, "Setting Gas Flow Rate".

7.Re-engage wire drive by pushing release lever to down posi- tion to feed wire.

8.Momentarily squeeze trigger and verify that wire feeds proper- ly. Trim wire to approximately 1/4" (6 mm) from end of contact tip.

WARNING: When using an open arc process, it is

necesary to use correct eye, ear, head,

and body protection.

9.Position gun over joint at 10° pushing angle. End of wire may be lightly touching the work.

10.Lower welding helmet, close gun trigger, and begin welding. Hold the gun so that the contact tip to work distance is about 1/2 inch (13 mm).

11.To stop welding, release the gun trigger and then pull the gun away from the work after the arc goes out.

12.When no more welding is to be done, close valve on gas cylin- der, momentarily operate trigger to release gas pressure in line and turn off power source.

13.Note that clogged tips can often be salvaged by peeling away melted wire.

Procedure Settings

The following procedure settings for 4043 aluminum wire and argon gas can be used as starting points for developing specific welding procedures:

 

 

 

 

 

 

Wire

 

Metal

 

Wire

Amps

Size

 

Thickness

 

Speed

DC

in. (mm)

ga.

in. (mm)

Arc Volts

ipm (mpm)

(+}

.030 (0.8)

22

.030 (0.8)

13-14(1)

200

(5.1)

40

 

20

.036 (1.0)

13-14(1)

240

(6.1)

40

 

18

.048 (1.2)

14-15(1)

290

(7.4)

50

 

16

.060 (1.6)

15-16(1)

340

(8.6)

60

 

14

.075 (2.0)

16-17(1)

370

(9.4)

70

 

12

.105 (2.5)

16-18(1)

430 (10.9)

90

 

10

.135 (3.5)

24-26

460 (11.7)

110

 

3/16

(5.0)

24-26

500 (12.7)

150

 

1/4

(6.0)

28-29

560 (14.2)

180

 

3/8

(10.0)

28-30

600 (15.2)

200

.035 (0.9)

22

.030 (0.8)

13-14(1)

150

(3.8)

40

 

20

.036 (1.0)

13-14(1)

175

(4.4)

40

 

18

.048 (1.2)

(1)

215

(5.5)

50

 

13-14(1)

 

16

.060 (1.6)

14-16(1)

250

(6.4)

60

 

14

.075 (2.0)

14-16

270

(6.9)

70

 

12

.105 (2.5)

16-18(1)

320

(8.1)

90

 

10

.135 (3.5)

24-26

410 (10.4)

110

 

3/16

(5.0)

24-26

450 (11.4)

150

 

1/4

(6.0)

26-28

530 (13.5)

180

 

3/8

(10.0)

26-29

560 (14.2)

200

 

1/2

(12.0)

26-30

600 (15.2)

220

3/64(1.2)

10

.135 (3.5)

20-21(1)

180

(4.6)

110

 

3/16

(5.0)

20-21(1)

220

(5.6)

150

 

1/4

(6.0)

27-28

250

(6.4)

180

 

3/8

(10.0)

25-30

260

(6.6)

200

 

1/2

(12.0)

25-31

270

(6.9)

220

 

3/4

(20.0)

25-31

290

(7.4)

250

(1)Short arc transfer.

Setting Gas Flow Rate

Gas handling systems having adjustable flow valves should be set for the following argon flow rates, depending on base metal thickness and welding position.

ARGON SHIELDING GAS FLOW RATES

 

 

 

 

 

 

Material Thickness

Welding Position

Flow Rates

 

In Inches and (mm)

In cf/hr (l/mln)

 

1/16 (1.6 mm)

Flat

30

 

 

 

 

(11.8)

 

 

3/32 to 3/16

Flat, Vertical,

35

 

 

(2.4 to 4.8 mm)

Horizontal, Overhead

(14)

 

 

1/4 to 3/8

Flat, Vertical,

35 (14)

 

 

(6.3 to 9.5 mm)

Flat Vertical,

35 (16.5)

 

 

 

Horizontal, Overhead

40 (18.9)

 

 

3/4 (19 mm)

Flat, Vertical

35 (16.5)

 

 

 

Horizontal, Overhead

40 (18.9)

 

7

Image 13
Contents Cougartm Safety depends on youFor Engine Powered equipmentElectric Magnetic Fields May be dangerousFumes and Gases Electric Shock can kill ARC Rays can burnCan be dangerous For Electrically Cause fire or explosionIii Précautions DE Sûreté Pour Précautions DE Sûreté SafetyLES Machines À Souder À Transformateur ET ÀThank You Table of Contents Cougar Push Pull Gun General Information Model Cougar Push-Pull Gun with Remote Wire Speed ControlSupplied with Safety Precautions Cougar Push Pull Gun InstallationUnpacking the Push-Pull Gun Push-pull Gun Familiarization Connecting to Power SourceCougar Push Pull Gun Operating Instructions Setup ProcedureDrive Roll Groove Selection Setting Gas Flow Rate Procedure SettingsCOUGARPush Pull Gun Operating Instructions Making a WeldMaintenance Cougar Push Pull Gun ACCESSORIES/MAINTENANCEAccessories consult Lincoln Sales Bulletin E12.16 Problem Symptoms Remedy Cougar Push Pull Gun Troubleshooting GuideTesting the Potentiometer Testing the TorchTesting the Trigger Switch Motor CheckPart Description Cougar Push Pull GunS26374-14 Cougar LX Push Pull GunPrecaucion Aviso DE Page LNC.0016