Longevity 880306 Manuel d'instructions télécharger pdf (Page 18)

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Rods Sticking to the Work

If you are new to arc welding you will frequently stick the rod to the work when trying to

start the arc. The rod welds itself to the work and it won't be possible to remove it just by

pulling. Moving the rod backwards and forwards, or twisting the rod should fatigue the joint

allowing you to remove the rod. If you have a crocodile clip type electrode holder you can

just release the rod from the holder.

There's no need to panic when the rod sticks. It's normal for rods to stick occasionally, so

arc welders are designed to cope with it for a short time. Inverter welders will reduce

voltage automatically, and transformer welders should only go up in smoke if the rod is

stuck for a prolonged period.

For interest, the photo shows the electrode of a 7018 rod recessed into the flux coating

after welding - it illustrates why the flux coating needs to be removed before the arc will

start.

A tip to make starting much easier

Keep some scrap material near the work and start the rod on that before beginning your

weld. This will remove excess flux and warm up the rod which will make it much easier to

start your weld.

Learning to Arc Weld - Basic Technique

Arc welding takes some effort to learn, and it is very sensitive to the position of the work.

It's a good idea to keep things easy to begin with by laying beads on the flat. We'll cover

joints later.

The following setup is a good starting point for this tutorial:

 Work: 6mm mild steel. Arc welding is more tolerant to slightly rusty metal and mill

scale than other electric welding processes, but it is good practice to clean the worst off

with a grinder before welding.

 Rods: 3.2mm 6013 rods. USE GOOD QUALITY RODS! A forum member trying to

learn with DIY store rods had terrible trouble until someone sent him a few brand name

rods to prove a point. Also 3.2mm rods are easier to learn with than 2.5mm rods.

 Amps: 110 amps. (if you want to use 2.5mm rods reduce the current to about 80

amps - the current is determined more by the rod size than the thickness of sheet).

 Polarity: DCEP (rod positive, earth negative - this is the opposite of the polarity

used in TIG). Use AC if that's all you have.

Rod Angle (lead angle)

For welding on the flat the rod should be angled 10 to 20 degrees from vertical and pulled

in the direction of the arrow. The angle of the rod prevents the slag overtaking the rod

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Longevity 880306 Manuel d'instructions Page 18