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Hitachi EW2800 [9/44] Quality of the weld

 

Touch, with the electrode fastened, in the

electrode holder, the work piece until the arc

       



Avoid hammering the workpiece with the

electrode since it may loose the coating



- After striking the arc keep feeding the

electrode into the weld pool with an angle of





of the arc can also be controlled by lifting or

-

tion of the welding angle may increase the

size of the weld pool improving the capacity



- At the end of the weld let the slag cool off



CAUTION:

Protect your eyes when hitting the slag

with the chip hammer to avoid damages.

CAUTION:

A bad start can be due to the dirty wor-

kpiece, a bad connection between earth

cable and work piece, or the bad faste-

ning of the electrode in the electrode

holder.

7.0 QUALITY OF THE WELD

The quality of the weld will depend mainly on

the ability of the welder, on the type of weld

and on the quality of the electrode: Choose

the proper electrode before attempting to

weld, paying attention to the thickness and



Correct welding current.

If the current is too high the elctrode will burn

fast and the weld pool will be wide irregula-



too low you will lack power and the weld pool



Correct arc length.

If the arc is too long it will cause spatters and



-



Correct welding speed.

The correct welding speed will consent to

achieve a weld of proper width, without wa-



8.0 TIG WELDING

The TIG process uses the electrical arc

struck between the tungsten electrode of the



In TIG welding the torch is always con-

nected to the negative pole of the welder.

Welder preparation:

- Select TIG welding thru the Selector on



- Connect the earth cable to the positive

pole of the welder and the earth clamp to the



- Connect the TIG torch to the negative

pole of the welder and the gas hose to the



-

led using the knob on the torch handle.

Use inert gas (argon ) only.

 

9.0 TIG WELDING BY SCRATCH ARC

- Ensure the electrode at the torch nozzle,



electrode is sharply pointed with an angle of



- Set the welding current considering the

thickness of the material to be welded and of

the diameter of the tungsten electrode to be



- Open the gas valve on the torch handle,

       

Cover your face with the head shield, bring

the torch to within 3-4mm of the work, and

-

    

Scratch the tip of the electrode until an arc

develops, quickly withdraw the electrode and







REMEMBER to turn OFF the gas immediate-



Содержание

Похожие устройства

Protect your face with a mask or a helmet Correct welding speed Touch with the electrode fastened in the The correct welding speed will consent to electrode holder the work piece until the arc achieve a weld of proper width without wa will be struck the inverter is featuring hot ves or craters start to improve the striking Avoid hammering the workpiece with the 8 0 TIG WELDING electrode since it may loose the coating and increase the arc striking difficulties The TIG process uses After striking the arc keep feeding the electrode into the weld pool with an angle of about 60 and moving left to right so that you may control visually the welding The length of the arc can also be controlled by lifting or lowering slightly the electrode Also a varia tion of the welding angle may increase the size of the weld pool improving the capacity of surfacing of the slag At the end of the weld let the slag cool off before removing it using the brush hammer CAUTION Protect your eyes when hitting the slag with the chip hammer to avoid damages CAUTION A bad start can be due to the dirty wor kpiece a bad connection between earth cable and work piece or the bad faste ning of the electrode in the electrode holder 7 0 QUALITY OF THE WELD The quality of the weld will depend mainly on the ability of the welder on the type of weld and on the quality of the electrode Choose the proper electrode before attempting to weld paying attention to the thickness and composition of the metal to be welded Correct welding current If the current is too high the elctrode will burn fast and the weld pool will be wide irregularand difficult to be controlled If the current is too low you will lack power and the weld pool will be narrow and irregular Correct arc length If the arc is too long it will cause spatters and small fusion of the welding piece If the arc is too short the arc heat will be insufficient cau sing the electrode to stick to the workpiece the electrical arc struck between the tungsten electrode of the torch and the work piece surface In TIG welding the torch is always con nected to the negative pole of the welder Welder preparation Select TIG welding thru the Selector on the front panel Connect the earth cable to the positive pole of the welder and the earth clamp to the work piece Connect the TIG torch to the negative pole of the welder and the gas hose to the pressure regulator of the gas cylinder The flow of the gas is manually control led using the knob on the torch handle Use inert gas argon only Turn the inverter on 9 0 TIG WELDING BY SCRATCH ARC Ensure the electrode at the torch nozzle protrudes by 4 5mm also ensure that the electrode is sharply pointed with an angle of 40 60 Set the welding current considering the thickness of the material to be welded and of the diameter of the tungsten electrode to be used Open the gas valve on the torch handle allowing gas to flow from the torch nozzle Cover your face with the head shield bring the torch to within 3 4mm of the work and at an angle of 45 so that the ceramic noz zle gently touches the work surface fig b Scratch the tip of the electrode until an arc develops quickly withdraw the electrode and maintaning a gap of approx 3 4 mm proceed to weld To stop welding simply remove the torch from the work piece REMEMBER to turn OFF the gas immediate ly you finish welding 9

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