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To make best use of the machine, daily checking is very important. During the daily checking, please check in the
order of torch, wire-feeding vehicle, all kinds of PCB, the gas hole, and so on. Remove the dust or replace some
parts if necessary. To maintain the purity of the machine, please use original welding parts.

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Only the qualified technicians are authorized to undertake the repair and check task of this welding

equipment in case of machine fault.

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Control panel

1. Operation, replacement and installation of

Switch.

2. Switch on the power, and check if the power

indicator is on.

Fan

1. Check if the fan is functioning and the sound

generated is normal.

If the fan doesn’t work or the sound is
abnormal, do inner check.

Power supply

1. Switch on the power supply, and check if

abnormal vibration, heating of the case of this
equipment, variation of colors of case or buzz
presents.

Other parts

1. Check if gas connection is available, case and

other joints are in good connection.

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Nozzle

1. Check if the nozzle is fixed firmly

and distortion of the tip exists.

Possible gas leakage occurs due to the unfixed nozzle.

2. Check if there is spatter sticking

on the nozzle.

Spatter possibly leads to the damage of torch. Use anti-
spatter to eliminate the spatter.

Contact tip

1.

Check if the contact tip is fixed
firmly.

Unfixed contract tip possibly leads to the damage of
torch.

2.

Check if the contact tip is
physically complete.

The physically incomplete contact tip possibly leads to
the unstable arc and arc automatically terminating.

Wire feeding

tube

1. Measure length of wire feed

tube stretching out.

The length of the wire feed tub stretching out should be
long enough to contact the contact tip. Replace it if less
than 6mm, otherwise unstable arc possibly occurs.

2. Make sure that there is the

agreement of wire and wire feed
tube.

Disagreement of the diameters of wire and wire feed
tube possibly leads to the unstable arc. Replace it/them
if necessary.

3. Make sure that there is no

bending or elongation of wire
feed tube.

Bending and elongation of wire feed tube possibly leads
to the unstable wire feed and arc. Replace it if
necessary.

4. Make sure that there is no dust

or spatter accumulated inside
the wire feed tube, which makes
the wire feed tub blocked.

If there is dust or spatter, remove it.

5. Check if the wire feed tube and

O-shaped seal ring

are

physically complete.

The Physically incomplete wire feed tube or O-shaped
seal ring possibly leads to the excessive spatter.
Replace the wire feed tube or O-shaped seal ring if
necessary.

Diffuser

1. Make sure that the diffuser

of required specification is
installed and is unblocked.

Defection weld or even the damage of torch
occurs due to the non-installation of diffuser or
the unqualified diffuser.

INSTRUCTION MANUAL

·

MIG 250

i

Summary of Contents for MIG250i

Page 1: ...L L LO O OT T TO O OS S S M M MI IIG G G2 2 25 5 50 0 0iii M M MI I IG G G W W We e el lld d de e er r r ...

Page 2: ...enance 10 Daily Checking 11 Hereby we state that we provide one year of guarantee for this welding equipment since the date of purchase Please read and understand this instruction manual carefully before the installation and operation of this equipment The contents of this manual may be revised without prior notice Please visit us http www uwelding com au for more information i ...

Page 3: ... Sm m mo o ok k ke e e a a an n nd d d g g ga a as s s g g ge e en n ne e er r ra a at t te e ed d d w w wh h hi i il l le e e w w we e el l ld d di i in n ng g g o o or r r c c cu u ut t tt t ti i in n ng g g h h ha a ar r rm m mf f fu u ul l l t t to o o p p pe e eo o op p pl l le e e s s s h h he e ea a al l lt t th h h Avoid breathing the smoke and gas generated while welding or cutting Keep t...

Page 4: ...reactor control stable welding little splash deep melting excellent welding seam reshaping Slow weld wire feeding for arc starting be able to cut small ball after welding successful arc starting Suit for welding medium thin plate more than 0 8mm Small sized light weighed easy to operate economical practical T T Th h he e e e e ef f ff f fi i ic c ci i ie e en n nc c cy y y o o of f f t t th h hi i...

Page 5: ... 0 8 1 0 Size of the machine mm 500 270 440 Weight Kg 26 Thickness mm 0 8 Insulation class F Protection class IP21 MAIN SWITCH P P PR R RO O OE E EC C CT T T C C CI I IR R RC C CU U UI I IT T T P P PO O OW W WE E ER R R S S SU U UP P PP P PL L LY Y Y CONTROL C C CI I IR R RC C CU U UI I IT T T W W WI I IR R RE E E F F FE E EE E ED D DE E ER R R N N NO O OT T TE E E T T TH H HE E E I I IN N NP P PU...

Page 6: ... 50mm2 70mm2 in case of the maximum applicable current 170A 250A 450A The increase of the cross section area of welding cable is necessary according to the current density The recommended ratio of amperage and cross section area of lead is 5A mm2 2b Connect the fast connector of the torch to the of on the panel board and tighten it clockwise 3 3 3 I I In n ns s st t ta a al l ll l la a at t ti i i...

Page 7: ...ack and use the hose clamp to Tighten it to prevent leaking or air in so that the welding point is protected Please note 1 Leakage of shielding gas affects the performance of arc welding 2 Avoid the sun shining on the gas cylinder to eliminate the possible explosion of gas cylinder due to the increasing pressure of gas resulted by heating of sun shining 3 It is extremely forbid to knock at gas cyl...

Page 8: ...g g g s s sp p pe e ee e ed d d The welding quality and productivity should be taken into consideration for the option of welding speed In case that the welding speed increases it weakens the protection efficiency and quickens the cooling As a consequence it is not optimal for the seaming In the event that the speed is too slow the work piece will be easily damaged and the seaming is not ideal In ...

Page 9: ...l ll l le e et t t w w we e el l ld d di i in n ng g g P P Pl l le e ea a as s se e e r r re e ef f fe e er r r t t to o o t t th h he e e f f fo o ol l ll l lo o ow w wi i in n ng g g f f fi i ig g gu u ur r re e e Plate thickness t mm Gap g mm Wire φ mm Welding current A Welding voltage V Welding speed cm min Gas volume L min 0 8 0 0 8 0 9 60 70 16 16 5 50 60 10 1 0 0 0 8 0 9 75 85 17 17 5 50 60...

Page 10: ...ow w wi i in n ng g g f f fi i ig g gu u ur r re e e Plate thickness t mm Corn size I mm Wire φ mm Welding current A Welding voltage V Welding speed cm min Gas volume L min 1 2 2 5 3 0 1 0 70 100 18 19 50 60 10 15 1 6 2 5 3 0 1 0 1 2 90 120 18 20 50 60 10 15 2 0 3 0 3 5 1 0 1 2 100 130 19 20 50 60 10 20 2 3 3 0 3 5 1 0 1 2 120 140 19 21 50 60 10 20 3 2 3 0 4 0 1 0 1 2 130 170 22 22 45 55 10 20 4 5...

Page 11: ...t at any moment refer to the optioned duty cycle Make sure that the welding current should not exceed the max load current Over load current could obviously shorten the welding equipment s life or even burn the equipment 2 3 Over voltage is forbid Regarding the power supply voltage range of the welding machine please refer to Main parameter table This welding equipment is of automatic voltage comp...

Page 12: ... due to the unfixed nozzle 2 Check if there is spatter sticking on the nozzle Spatter possibly leads to the damage of torch Use anti spatter to eliminate the spatter Contact tip 1 Check if the contact tip is fixed firmly Unfixed contract tip possibly leads to the damage of torch 2 Check if the contact tip is physically complete The physically incomplete contact tip possibly leads to the unstable a...

Page 13: ...e excessive spatter and unstable arc 2 Check if the wire groove is blocked Replace it if necessary Pressure adjusting wheel 1 Check if the pressure adjusting wheel can rotate smoothly and it s physically complete Unstable rotation or physically incompleteness of the wheel possibly leads to unstable wire feeding and arc P P Pa a ar r rt t t C C Ch h he e ec c ck k k R R Re e em m ma a ar r rk k ks ...

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