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15

Technical Services

Feedability

A

B

C

D

E

G

F

H

I

A - CONTACT TIP

B - JUMPER LINER

C - CONDUIT

D - LINER

E - OUTLET GUIDE

F - “U” GROOVE DRIVE ROLLS

G - INLET GUIDE

H - ALUMINUM ELECTRODE

I - ELECTRODE SPOOL

Aluminum welding equipment demands attention to detail as feedability affects performance and productivity. Below are

areas of concern that can improve feedability, reduce downtime, and minimize maintenance costs.

Correct Contact Tip Size (I.D. and length)

„

„

I.D. 10% larger for hard wire

„

„

I.D. 20% larger for soft wire

„

„

Longer is better

„

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Remove burrs from tip entrance

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„

Polish, clean, and inspect contact tips

1

„

„

Do not bend or crimp tips

Drive Rolls

„

„

U-groove type reduces shavings

„

„

Clean and polish rolls regularly

2

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„

Inspect for sharp edges, embedded particles,

and misalignment

„

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If V-groove are used on one side, use a flat

on the other

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„

V-grooves rollers with an angle > 60 degrees

„

„

Plastic rolls can wear unevenly causing wire distortion

Gun Liners and Wire Guides

„

„

Teflon is soft and can hold embedded particles

„

„

Nylon is tough, holds its shape and reduces

embedded particles

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Right size liner

„

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Cut to the proper length

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Plastic guides such as Nylon work to reduce shavings

Torch and Nozzles

„

„

Straight nozzles aspirate less air than tapered

„

„

Water-cooled torches are more efficient

„

„

Curved torches require more drive force

„

„

Overheated torches can melt liners and ruin parts

„

„

Aluminum and argon lower the duty cycle of torches

(for torches rated with low voltage and CO

2

gas)

„

„

Push/pull for whip lengths over 9 ft. (3 m)

„

„

Slave in the rear push/pull reduces liner wear

and feeding issues

(1) AlcoTec offers a contact tip polishing kit (part no. TIP-TUBE)

(2) AlcoTec offers a drive roll polishing kit (part no. DRV-ROLLPOLISH)