Worldwel longrun 350LA User manual

INVERTER AC/DC TIG WELDER
350LA, 500LA, 600LA
OPERATION MANUAL
DO NOT INSTALL, OPERATE OR MAINTAIN THIS MACHINE WITHOUT READING THIS
MANUAL AND PLEASE ALWAYS THINK BEFORE YOU ACT.
www.worldwel.com

■ TECHNICAL SPECIFICATIONS
- SUFFICIENT CAPACITY of main transformer by self-manufacturing
- ELECTRIC SHOCK PROTECTOR reduces No load voltage to 14VDC for user safety when welder is
not in use.
- Easy to verify welding current during welding by DIGITAL AMMETER.
- Optional REMOTE CONTROL BOX is available for adjusting output current without going back to
power source.
ITEM UNIT 350LA 500LA 600LA
Rated Input Voltage V
220/380/440, 50/60Hz
3 Phase 3 Phase 3 Phase
Process ― TIG STICK TIG STICK TIG STICK
Rated Output Current A 350 200 500 340 600 400
Input Capacity 380V KVA 13.5 7.3 21.7 15.9 25.9 17.8
No Load Voltage V 60 (380V) 62 (380V) 60 (380V)
Output Current Range A 10~350 20~200 15~500 20~340 15~600 20~400
Output Voltage @ rated
output V 24 28 30 33.6 34 36
Duty Cycle @ rated output % 60
Dimension (W×D×H) mm 385 × 765 × 610 385 × 765 × 610 385 × 825 × 610
Weight kg 59 69 74
Crater Current Range A 10 ~ 350 15 ~ 500 15 ~ 600
Start Current Range A 10 ~ 350 15 ~ 500 15 ~ 600
Pulse Current Range A 10 ~ 350 15 ~ 500 15 ~ 600
Pulse Width Range % 15 ~ 85 15 ~ 85 15 ~ 85
Pulse Frequency Range Hz 10 ~ 500 10 ~ 500 10 ~ 500
Up slope Time Range sec
0.1 ~ 5 0.1 ~ 5 0.1 ~ 5
Down slope Time Range sec
Gas After Flow sec 0.5 ~ 15 0.5 ~ 15 0.5 ~ 15
Cooling Method ― Air cooling / Water cooling Air cooling / Water cooling Air cooling / Water cooling

General Safe Practices
■ Wear approved safety glasses with side shields under your welding helmet or face shield and at all
times in the work area.
■ When working above floor level, use a safety belt to protect yourself from a fall should you get a
shock.
■ Do not install or place machine on or over combustible surfaces.
■ Be sure that all installation, operation, maintenance and repair procedures are performed only by
qualified persons.
Electric shock can kill.
■ Wear Dry, hole-free insulating gloves and body protection. Do not touch electrode with bare hand. Do
not wear wet or damaged gloves.
■ Do not touch live electrical parts.
■ Never dip the electrode in water for cooling.
■ Properly install and ground all equipment.
■ Protect yourself from electric shock by insulating yourself from work and ground. Use non-flammable,
dry insulating material if possible, or use dry rubber mats, dry wood or plywood, or other dry insulating
material big enough to cover your full area of contact with the work or ground, and watch for fire.
■ Turn off input power using the disconnect switch at the fuse box before working on the equipment.
■ Frequently inspect input power cord for damage or bare wiring and repair or replace cord immediately
if damaged.
Fumes and gases can be dangerous.
■ Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases.
When welding, keep your head out of the fume. Use enough ventilation and/or exhaust at the arc to
keep fumes and gases away from the breathing zone.
■ Use enough forced ventilation or local exhaust (forced suction) at the arc to remove the fumes from
your breathing area.
■ Use a ventilating fan to remove the fumes from the breathing zone and welding area.
Arc rays can burn eyes and skin.
■ Use welding helmet with correct shade of filter to protect your eyes from sparks and the rays of the
arc.
■ Wear welders cap and safety glasses with side shields. Use ear protection when welding out of
position or in confined spaces. Button shirt collar.
■ Wear complete body protection. Wear oil-free protective clothing such as leather gloves, heavy shirt,
cuffless pants and high boots.

1. Welding sparks can cause fire or explosion.
■ Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding
sparks from starting a fire. Remember that welding sparks and hot materials from welding can easily go
through small cracks and opening to adjacent areas. Avoid welding near hydraulic lines.
■ When not welding, make certain no part of the electrode circuit is touching the work or ground.
Accidental contact can cause overheating and create a fire hazard.
■ Do not weld on drums, tanks, or any closed containers unless a qualified person has tested it and
declared it or prepared it to be safe.
■ Connect the work cable to the work as close to the welding area as practical. Work cables connected
to the building framework or other locations away from the welding area increase the possibility of the
welding current passing through lifting chains, crane cables or other alternate circuits. This can create
fire hazards or overheat lifting chains or cables until they fail.
■ INSTALLATION
● The welding machine shall be installed at a place ;
 free from the inflammables
 less humidity, dirt and dust
 protecting from influence of direct sunlight, wind and rain
 not generated oil vapor and corrosive gas
 operating temperature range is from -10℃ to 40℃
 least 30㎝ away from wall and other welding machine
● Input Connection (Rear of the machine)
Be sure the voltage, phase and frequency of the input power is as specified on the name plate
located on the rear panel of the machine.
 To connect the power cables, turn the power switch OFF
 Verify the voltage to be supplied from main power.
 Open the cover of terminal plate and connect the power cable to the power input terminal on the rear of
the machine and close the cover of terminal plate.
√ If the input power is single phase, connect two cables on left and right terminal without center.
 For grounding the machine, connect a ground wire to the ground terminal marked with the symbol is
located on the rear panel of the machine.

 Connect the gas hose to the gas input terminal.
 If you want to connect the water cooling unit, connect the
water hose to WATER IN terminal.
※ Input voltage selection
 Remove the cover of input voltage selection plate.
 Position the copper bars for the voltage would be used
 For 380V and 440V input, position the switch for the voltage would be
used which is inside welder after removing top cover.
220V 380V 440V
● Output Connection (Front of the machine)
 Connect the work cable (which is connected to the work clamp) to the METAL terminal.
 To connect the TIG torch, connect a electrode cable to the TORCH terminal and a torch switch
connector to the torch switch receptacle and a gas connector to the output gas receptacle.
 If you want to connect the remote controller, connect the connector of remote controller to REMOTE
CONTROL terminal.
 If the water cooling unit is installed, connect the water input hose of water cooled torch to WATER OUT
terminal of welder.

[ AIR COOLING ] [ WATER COOLING ]
Output connection for stick welding
 Connect the work cable (which is connected to the work clamp) to the TORCH terminal.
 Connect the electrode cable (which is connected to the electrode holder) to the METAL terminal.

■ FRONT PANEL
1 Power Switch When it is turn on, the cooling fan and all of electrical circuit inside the machine
will be operated.
2 Ammeter Displays the welding current
3 Power Lamp It indicates that the machine is on and input voltage is within acceptable range.
4 Ready Lamp It indicates that the machine is ready to run. If the warning lamp is turn on, then
it will be off.
5 Warning Lamp
It indicates the thermal over load or output disabled by any electrical problems or
the water pressure. When it is on, the machine will not supply power at the
output.
- If over-heating occurs, it will blinking on until the machine has sufficiently
cooled by cooling fan or water.
- If the output is disabled by any electrical problems or the insufficiency of water
supply pressure, it will stay on.
6 Water Lamp If selected the water cooling, it is turn on by the insufficiency of water supply
pressure.
7 Welding Mode Selector It has four welding modes - Crater Off, Crater On, Crater Repeat and Stick.
8 Welding Current Control Adjust the welding current
9 Pulse Current Control Adjust the pulse current
10 Start Current Control Adjust the start current
11 Up slope Time Control It controls the time to reach to the welding current from the start current.

12
Gas Check Switch
It is for checking the flow of the gas. If this switch is ON, then the gas is flowed
by opening the solenoid valve inside the machine.
13
Pulse Width Control
It controls the pulse width
14
Pulse Frequency Control
It controls the pulse frequency. If the low pulse selected at the pulse frequency
selection switch, apply the inside circle 0.5-25Hz or if the high pulse selected,
apply the outside circle 10-500Hz.
15 Pulse Frequency selection switch
It choose the pulsed TIG (Low pulse, High pulse) or non pulsed TIG.
When compared with non pulsed TIG welding performed at the same average
current, the pulsed TIG get better results smaller heat affected zone, fewer
deformations and reduced chance of cracking and gas entrapment.
16 Crater current control It controls the crater current. It is important to get the good welding quality.
17 Down slope time control
It controls the time to reach to the crater current from the welding current. It is
important to carefully control the downslope of current to get the good welding
bead.
18 Cooling mode selection switch It choose the cooling mode "WATER COOL" or "AIR COOL"
19 Gas after flow time control
The output current of the machine will turn OFF and then the gas valve will
remain open to continue the flow of the gas. It adjusts the duration of this
after-flow time.
20 Cleaning width control It is for getting the better welding bead when AC TIG welding.
21 AC TIG / DC TIG selection switch AC TIG should be selected if aluminum would be welded.

■ Start Up
Stick Welding
TIG Welding
 
Turn On the main power supplied to welder Turn On the main power supplied to welder
 
Select "STICK" from the welding mode selector Select "WATER COOL" or "AIR COOL" from the
Cooling mode selection switch
 
Connect the remote controller to "REMOTE
CONTROL" terminal if necessary
Select Crater Off or Crater On or Crater Repeat
from welding mode selector
 
Turn On the power switch of welder, and then
verify that the power lamp and ready lamp are On
and the cooling fan is running
Select "AC TIG" or "DC TIG" from AC TIG / DC TIG
selection switch
 
Start to weld with adjusting the proper welding
current
Adjust properly the pulse frequency, pulse
width, start current, crater current, upslope time,
downslope time, gas after-flow time

Connect the remote controller to "REMOTE
CONTROL" terminal if necessary

Open the valve of gas tank

Turn On the power switch of welder, and then
verify that the power lamp and ready lamp are
On and the cooling fan is running

Regulate the gas flowed with pressing the torch
switch

Start to weld with adjusting the proper welding
current and crater current

■ Welding Mode
Crater Off
Press and hold the torch switch, the machine will open the gas valve to start the flow of the
shielding gas during the pre-flow time and then the arc is started at welding current. When
finish to weld, release the torch switch, then the arc is off and flow the gas during the gas
after-flow time.
Crater On
Press and hold the torch switch, the machine will open the gas valve to start the flow of the
shielding gas during the pre-flow time and the arc is started at the crater current. At this time
release the torch switch, the output current will be increased from the crater current to the
welding current during the up slope time. When finish to weld, press and hold the torch switch,
the output current will be decreased from the welding current to the crater current during the
down slope time. At this time release the torch switch, the arc is off and flow the gas during the
after-flow time.
Crater Repeat
Press and hold the torch switch, the machine will open the gas valve to start the flow of the
shielding gas during the pre-flow time and the arc is started at the crater current. At this time
release the torch switch, the output current will be increased from the crater current to the
welding current during the up slope time. At this time Press and hold the torch switch, the
output current will be decreased to crater current and then release the torch switch, the output
current will be increased to welding current. When finish to weld, press and hold the torch
switch, the output current will be decreased from the welding current to the crater current during
the down slope time. At this time just release the torch from the metal to be welded and then
the arc is off and flow the gas during the after-flow time.
① Welding current
② Start current
③ Crater current
④ Up slope time
⑤ Down slope time
⑥ Gas pre-flow time
⑦ Gas after-flow time
⑧ Pulse current

■ TROUBLESHOOTING
√ If all recommended action have been checked and the problem persists, please contact our service
center
SYMPTOMS
REASON RECOMMENDED ACTION
Cooling fan does not run when the power switch is
turn on.
  No input voltage
  Fuse (3A) is blown
  Power switch broke down
  Cooling fan broke down
  Verify input voltage
  Replace Fuse (3A)
  Replace Power switch
  Replace Cooling fan
Gas does not
flow from torch
Gas does not flow from torch
when the GAS CHECK switch is
"CHECK" position
  Close the valve of gas tank
  Gas check switch broke down
  Open the valve of gas tank
  Replace Gas check switch
Gas does not flow from torch
when pressing the torch switch
  Torch switch connector does not
connect perfectly
  Torch switch broke down
  Control PCB broke down
 Reconnect Torch switch connector
  Replace Torch
  Replace Control PCB
Gas flows continuous at "Off" position of GAS CHECK
switch
  GAS CHECK switch broke down
  Torch broke down
  Control PCB broke down
  Replace GAS CHECK switch
  Replace Torch
  Replace Control PCB
It does not adjust the welding current and crater
current on the remote controller
  Remote control connectors of
remote controller does not
connect perfectly
  Volume broke down
  Control PCB broke down
  Reconnect Remote control
connectors of remote controller
  Replace Volume
  Replace Control PCB
Arc does not started
  Torch cable is broke
  Torch switch connector does not
connect perfectly
  Work cable does not connect
perfectly
  Torch broke down
  Control PCB broke down
  Repair Torch cable
  Reconnect Torch switch connector
  Reconnect Work cable
  Replace Torch
  Replace Control PCB
Crater does not work   Crater select switch broke down
  Control PCB broke down ․ Contact our service center

350LA PARTS LIST
NO.
PART NAME DESCRIPTION QTY.
1 Control Transformer 9645 2
2 Control Transformer 4114 1
3 Control Transformer 5719 1
4 Main PCB WNLT-01 1
5 HF PCB TMD-45A89 1
6 Control Transformer PCB VAC-01 1
7 PWM PCB WAPD-01 1
8 PWM PCB WAPD-02 1
9 Relay HR710-2PB DC24V 1
10 Relay LY2 1
11 Relay PCB WAPO-01 1
12 FUSE 5A 1
13 MF Condensor 15㎌/800V 4
14 MF Condensor 10㎌/800V 2
15 Condensor 2700UF/400V 2
16 Input Terminal 6M/M 1
17 NFB 3P-80A NDB3-100J4 80/3LTS 1
18 Front PCB 500LT3-VR 1
19 Front PCB 500LT3-LED 1
20 META PCB META V1 1
21 VOLUME RV24YN, 500K 2
22 Selector Switch XK5378 1
23 FAN UF12A23STH-M5 120T 2
24 FAN UF15P23BTH-M5 150T 1
25 Terminal MJ-175 1
26 Toggle Switch DWT-6210 1
27 InputDiode 6RI 100E-080 1
28 IGBT 200A/600V 2
29 IGBT Drive PCB WGE-01(2K10Ω) 2
30 IGBT Drive PCB WGE-01(10K6.8Ω) 2
31 TIG IGBT Snubber WSB-01 1
32 Temp. Switch N85 1
33 Pressure Sensor DP-07 1
34 Solenoid Valve DC24V, 3.0Φ1
35 IGBT 200A/1200V 2
36 OutputDiode 300A/600V 2
37 Resistor, Discharge 20W10Ω4
38 Resistor, Discharge 20W50Ω1
39 Terminal,MID MID 2
40 Connector K25-2R 2
41 Nipple 9/16* 6Φ2
42 Nipple 9/16*1/4 2
43 Noise Filter PCB WTF-02 1
44 Surge PCB WBP-03 1
45 Remote PCB WRM-01 1
46 Induction coil 350LA 1
47 Choke Transformer 350LA 1
48 Main Transformer 350LA 1
49 Resistor, Stick 200W100Ω1

500LA PARTS LIST
NO.
PART NAME DESCRIPTION QTY.
1 Control Transformer 9645 2
2 Control Transformer 4114 1
3 Control Transformer 5719 1
4 Main PCB WNLT-01 1
5 HF PCB TMD-45A89 1
6 Control Transformer PCB VAC-01 1
7 PWM PCB WAPD-01 1
8 PWM PCB WAPD-02 1
9 Relay HR710-2PB DC24V 1
10 Relay LY2 1
11 Relay PCB WAPO-01 1
12 FUSE 5A 1
13 MF Condensor 20㎌/800V 4
14 MF Condensor 10㎌/800V 2
15 Condensor 2700UF/400V 2
16 Input Terminal 6M/M 1
17 NFB 3P-80A NDB3-100J4 80/3LTS 1
18 Front PCB 500LT3-VR 1
19 Front PCB 500LT3-LED 1
20 META PCB META V1 1
21 VOLUME RV24YN, 500K 2
22 Selector Switch XK5378 1
23 FAN 120T 2
24 FAN 150T 1
25 Terminal MJ-175 1
26 Toggle Switch DWT-6210 1
27 InputDiode 6RI 100E-080 1
28 IGBT 200A/600V 2
29 IGBT Drive PCB WGE-01(2K10Ω) 2
30 IGBT Drive PCB WGE-01(10K6.8Ω) 2
31 TIG IGBT Snubber WSB-01 1
32 Temp. Switch N85 1
33 Pressure Sensor DP-07 1
34 Solenoid Valve DC24V, 3.0Φ1
35 IGBT 200A/1200V 2
36 OutputDiode 300A/600V 4
37 Resistor, Discharge 20W10Ω4
38 Resistor, Discharge 20W50Ω1
39 Terminal,MID MID 2
40 Connector K25-2R 2
41 Nipple 9/16* 6Φ2
42 Nipple 9/16*1/4 2
43 Noise Filter PCB WTF-02 1
44 Surge PCB WBP-03 1
45 Remote PCB WRM-01 1
46 Induction coil 500LA 1
47 Choke Transformer 500LA 1
48 Main Transformer 500LA 1
49 Resistor, Stick 200W100Ω1

600LA PARTS LIST
NO.
PART NAME DESCRIPTION QTY.
1 Control Transformer 9645 2
2 Control Transformer 4114 1
3 Control Transformer 5719 1
4 Main PCB WNLT-01 1
5 HF PCB TMD-45A89 1
6 PWM PCB WAPD-01 1
7 PWM PCB WAPD-02 1
8 Relay HR710-2PB DC24V 1
9 Relay LY2 1
10 Relay PCB WAPO-01 1
11 FUSE 5A 1
12 MF Condensor 30㎌/800V 4
13 MF Condensor 10㎌/800V 2
14 Condensor 3300UF/400V 2
15 Input Terminal 6M/M 1
16 NFB 3P-80A NDB3-100J4 80/3LTS 1
17 Front PCB 500LT3-VR 1
18 Front PCB 500LT3-LED 1
19 META PCB META V1 1
20 VOLUME RV24YN, 500K 2
21 Selector Switch XK5378 1
22 FAN 120T 2
23 FAN 150T 1
24 Terminal MJ-175 1
25 Toggle Switch DWT-6210 1
26 InputDiode 6RI 100E-080 1
27 IGBT 200A/600V 2
28 IGBT Drive PCB WGE-01(2K10Ω) 2
29 IGBT Drive PCB WGE-01(10K6.8Ω) 2
30 TIG IGBT Snubber WSB-01 1
31 Temp. Switch N85 1
32 Pressure Sensor DP-07 1
33 Solenoid Valve DC24V, 3.0Φ1
34 IGBT 200A/1200V 2
35 OutputDiode 300A/600V 4
36 Resistor, Discharge 20W10Ω4
37 Resistor, Discharge 20W50Ω1
38 Terminal,MID MID 2
39 Connector K25-2R 2
40 Nipple 9/16* 6Φ2
41 Nipple 9/16*1/4 2
42 Noise Filter PCB WTF-02 1
43 Surge PCB WBP-03 1
44 Remote PCB WRM-01 1
45 Induction coil 600LA 1
46 Choke Transformer 600LA 1
47 Main Transformer 600LA 1
48 Resistor, Stick 200W100Ω1