JAVAC NBM-500L Manual page 9

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Before welding

WARNING: Before welding, check that the data on the

power source plate correspond to the supply voltage and

frequency.

• Start up the welder by turning the switch on the back panel

to 1 (N.B.: the machine will display the last settings made

before it was switched off when it is turned on again);

• Set the various units according to the chosen welding

process.

Welding procedures

ELECTRODE WELDING (MMA)

For coated electrode welding with devices that can be

adjusted from the user's "Arc Force" and "Hot Start".

You can access this welding mode by adjusting the EN-

CODER knob to MMA

CODER key.

Ø ELECTRODE

6010

(mm)

6011

1,6

2,4

40-80

3,2

75-125

110-170 110-190

4,8

140-215 140-240

5,6

170-250 200-320

6,4

210-320 250-400

275-425 300-500

 Special functions

NOTE: Press the More parameters key to access more pa-

rameters page. A brief description of parameters that could

be changed follows

•

Hot start - i.e. overcurrent being supplied when the arc is

switched on. (Hot start - from 0 to 10 with an adjustment

interval at 1).

• Arc force -

Intensive arc drive force to prevent to be

stuck.

• Anti-stick - The switch of prevention to stick.

• VRD - The switch of voltage reduction safeguard.

MIG-MAG, MIG PULSED AND MIG DUAL PULSED WELD-

ING

Figure 13

and then pressing the EN-

ELECTRODE TYPE - Current adjustment field (A)

6012

6013

20-40

25-60

35-85

45-90

80-140

80-130

105-180 130-190

150-230 175-250

310-300 225-310

250-350 275-375

320-430 340-450

Connect up the welding cables following description in para-

graph "Connecting up welding - ELECTRODE welding ca-

bles".

 Welding parameters

Table 3

shows the values of current to use with the respec-

tive electrodes for the welding of common steels and

low-grade alloys. These data have no absolute value and

are indicative data only. For a precise choice follow the in-

structions provided by the electrode manufacturer. The cur-

rent to be used depends on the welding positions and the

type of joint, and it increases according to the thickness and

dimensions of the part.

A fairly approximate indication of the average current to use

in the welding of electrodes for ordinary steel is given by the

following formula:

where:

I = intensity of the welding current Øe = electrode diameter

Example: for electrode diameter 4 mm

The preset values of the welding current

with ENCODER knob) and open-circuit voltage will be dis-

played on the screen before welding starts.

The values of the welding current

ing and the welding voltage

during the welding process.

6020

6027

7014

80-125

100-150 125-185 110-160

160-240 150-210

210-300 200-275

250-350 260-340

300-420 330-415

375-475 390-500

The following jobs must be done before starting to weld:

•

Open the gas cylinder valve slowly and adjust the pressure

regulator to obtain about 1,3 - 1,7 bar;

•

Work the gas check key and adjust the flow to between 14

and 20 l/min. according to the current being used for

welding;

•

The welding machine is now ready to be used.

 Manual welding mode (activated for MIG-MAG welding

process only)

I = 50 × (Øe - 1 )

I = 50 × (4 -1 ) = 50 × 3 = 150A

will appear on the displays

7015

7024

7018

7016

7028

65-110

70-100

100-145

100-150 115-165 140-190

140-200 150-220 180-250

180-255 200-275 230-305

240-320 260-340 275-365

300-390 315-400 335-430

375-475 375-470 400-525

(adjustable

being used for weld-

Table 3

WELDING

THICKNESS

(mm)

≤ 5

≤ 6,5

> 3,5

> 6,5

> 9,5

> 13

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