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14

Holding and manipulating the torch

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Metal shielded gas welding can be welded in all posi-

tions: horizontal, vertical-down, vertical-up, overhead 

and in horizontal-vertical position.

At horizontal welding hold the torch vertical to the workpiece 

(neutral torch position) or up to 30° “pushing” the torch. At 

thicker welds, a slight dragging motion is sometimes used. 

For best depth of penetration and covering of shielded gas is 

the neutral position of the torch the most suitable one. Please 

notice if the torch is tilted to far, it could be that possible that 

air will be sucked into the shielded gas atmosphere (injection 

effect).
At vertical and overhead welding a slight pushing motion is re-

quired. Vertical down welding is most used for thin materials, 

for this kind of weld hold the torch at the neutral or slightly 

“dragging” position. For this kind of welding is some experi-

ence required cause the welding pool could run ahead and 

cause some lacks welding. With thicker material there is a 

danger of lacks of fusion cause the welding pool is very liquid 

due to high voltage.

Avoid extreme side to side movements to avoid that the weld-

ing pool will be damed up in front of the arc. This could cause 

lacks of fusion due to the welding pool flows ahead of the 

welding spot. The side to side motion should only be as wide 

as is necessary to reach both sides of the joint. If the joint is 

wide enough you should weld two parallel string beads.
At vertical-up position the side to side motion should describe 

the shape of an open triangle.

Length of the arc

Welding with a longer arc reduces the penetration, the weld-

ing bead is wide and flat with increased spattering. The weld-

ing material is transferred with slightly larger drops than at 

welding with a shorter arc. A longer arc is useful for welding a 

fillet weld to form a flat or concave seam.
Welding with a shorter arc (at the same amperage) increases 

the penetration, the welding bead is narrow and high with re-

duced spattering. The welding material is transferred with 

smaller drops as long as the welder is not welding with short 

arc.

Length of the wire electrode

The distance between the torch and the workpiece should be 

10 – 12 times the diameter of the wire. Altering the distance 

of the torch will influence the length of the electrode end.
A longer electrode end reduces the amperage and the pene-

tration.
A shorter electrode end increases the amperage if the wire-

feed speed remains the same.

 

Current and voltage pulses

Material transfer is achieved by current and voltage pulses 

controlled at the same rate as the pulse frequency. The arc 

power is changed by the ratio between basic and current 

pulses, the pulse duty factor between basic and current puls-

es and the pulse frequency.

Welding direction dragging

Welding direction pushing

Long arc

Short arc

14 Basics of pulsed arc welding

Long electrode end

Short electrode end

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Содержание MULTIMIG 400puls

Страница 1: ...EN Fabrik für Elektrotechnik GmbH x Postfach 10 59 60 x D 28059 Bremen Telefon 49 0 421 54 90 6 0 x Telefax 49 0 421 54 90 619 x vertrieb elektron bremen de x www elektron bremen de Operation Manual MULTIMIG 400puls ...

Страница 2: ...2 5 5 6 10 8 9 6 7 12 15 14 11 10 ...

Страница 3: ...welding site Secure yourself and the unit at higher or inclinational plac es Connect the unit only at mains with correct connection to ground earth and at prolongations and sockets too Wear correct protective clothing gloves and leather apron Protect the welding area with curtains or mobile walls against rays Do not thaw frozen waterpipes or conductions with this unit In high electrical risk areas...

Страница 4: ...against disturbances If other devices are disturbed it may be necessary to pro tect additionally The affected area can be bigger than your premises property depends of the building etc Please use the unit conform to the instructions of the manu facturer The user is responsible for installation and use of the machine Furthermore the user is responsible to eliminate the disturbances caused by electr...

Страница 5: ...tton 48 gas type solenoid valve is activated and adjust gas amount on the pressure reducer rule of thumb wire diameter x 10 gas flow Keep the wire insert switch pressed until the welding wire protrudes approx 10 mm out of the gas nozzle on the torch neck Select welding material by pressing button 44 Select wire diameter by pressing button 46 Select shielding gas type by pressing button 48 Select 2...

Страница 6: ... should be corresponding to the technical data How to insert the wirespool Open the lid at the machine or at the wire feed case 2 and screw off the nut 26 from the wire coil pick up 24 Put on the wire coil at the wire coil pick up and pay attention that the tappet is well insert at the coil 23 By use of small wire coils please use the adapter Adjust the brake 25 by releasing the torch button the w...

Страница 7: ...eter 32 This should be approx wire diameter x 10 l min The content of the cylinder is shown by the contentmanometer 33 How to modify the machine for aluminium welding Change the wire roll to a aluminium wire roll Change the steel torch against an aluminiumtorch or resp change the wire liner against a teflon liner Remove the capillary tube 42 at the central connection Cut the teflon liner close to ...

Страница 8: ...rrent material thick ness wire feed speed and arc length as indicated in the digital multifunction display 54 57 Downslope push button Switches the downslope function on or off A lit LED next to the push button indicates that the downslope is on 58 Arc length wire speed correction rotary pulse encoder For correction of the arc length or wire speed depend ent on setting menu extra arc lenght contro...

Страница 9: ... the character with the pushbuttons 48 and 44 Extras 1Machine data Operating system Master Version number operating system Master Operating system Process Version number operating system process Operating system DMRs Version number motor assembly ies Welding program version Version number welding programs Operating hour counter Indication of the welding duration in h min sec Configuration Machine ...

Страница 10: ... to frequently recurring welding tasks or save the set tings which individual welders use specifically for their jobs Programming jobs Determine the optimal welding adjustment Press the TT Save button 45 Save LED flashes Select the target job number with the push buttons 44 and 48 or with the torch rocker and confirm with the TT Enter push button 47 if you do not press Enter the Save LED goes out ...

Страница 11: ...et job number Assigning job texts An individual text can be assigned to each job in order to spe cially mark it or allocate it more clearly Switch on the Tiptronic function with the Tiptronic push button 49 Select the job number with the push buttons 44 and 48 Press the and push buttons 51 at the same time a flashing cursor appears in the display 50 in order to get into the edit mode The cursor is...

Страница 12: ...w rate of water Check level of cooling liquid and coolant filter E06 Overvoltage Output voltage too high Notify service E07 EEProm checksum error Adjustment data faulty or not available Switch system off and then on again E08 Wire feed tacho Current input from feed motor too high No tacho signal available Blow out torch package with compressed air and check wire feed unit E09 Error v a measuring F...

Страница 13: ...r vertical down welding The transfer of the electrode to the workpiece takes place partly in short circuit and in free flight Due to less short circuiting the weld ing pool is hotter than at the short circuit arc Welding with transitional arc provides higher electrode melt rate and is more economic than welding at short circuit arc Long arc Long arcs are typical at welding at the higher ampere ran...

Страница 14: ...t is wide enough you should weld two parallel string beads At vertical up position the side to side motion should describe the shape of an open triangle Length of the arc Welding with a longer arc reduces the penetration the weld ing bead is wide and flat with increased spattering The weld ing material is transferred with slightly larger drops than at welding with a shorter arc A longer arc is use...

Страница 15: ...ssary wire feed speed vD results from the product of pulse frequency fP and the wire length l melted in each pulse period From this relationship you see that a change in wire feed speed re quires a linear change in pulse frequency A rise in electrode melt rate by increasing wire feed speed therefore needs a higher pulse frequency The objective drop diameter should be about 1 2 mm with a wire diame...

Страница 16: ... or wire welds to the con tact tip Wire electrode is tight at the spool Check and change if necessary Burr at the wire beginning Cut the wire beginning again Irregular wire feeding or no wire feeding Wrong contact pressure at the wire feed rolls Adjust it as described in the manual Torch defect Check and change if necessary No brass pipe in the central connection or is dirty Install or clean the b...

Страница 17: ...amp and workpiece Ground cable not right plugged in Fasten ground cable by turning the plug to the right Defect torch Repair or replace it Hot plug of ground cable Plug was not tightened by turning to the right Check Higher wire wear out at wire feeding unit Wire rolls does not fit to the wire diameter Install right wire rolls Wrong contact pressure at wire feeding Adjust as described at the manua...

Страница 18: ...18 ELEKTRON Bremen GmbH Postfach 10 59 60 D 28059 Bremen Germany Telefon 49 0 421 54 90 6 0 Telefax 49 0 421 54 90 6 19 Subject to change 18 Service ...

Страница 19: ...19 Appendix mounting torch holder ...

Страница 20: ...326601 06 05 ...

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