- Read the electrode labels
- Prepare the welding machine
- Prime the bow
- How to arc weld with a coated electrode
The choice of electrode, the intensity setting and the connections on the set differ depending on the work to be done. These preparation steps are important and should not be sloppy.
Read the electrode labels
Type of metalArc welding is a autogenous welding. This means that it can hold metal parts of the same kind: steel with steel, stainless steel with stainless steel... So always choose a electrode composed of the same metal as the parts you are going to weld. There are some for all metals.
Diameter of the electrodeThe diameter of the electrode depends on the thickness of the pieces that you want to assemble. If you use an electrode that is too thin, you will run out of filler metal to ensure the strength of your weld. With an electrode too thick, on the contrary, you risk making pies, you will spend too much metal without achieving a stronger weld.
Electrical connectionThe electrodes are designed to be connected to the soldering station on the positive or negative pole: this depends on brands which indicate very clearly on the packaging. Take this into account and connect the electrode holder accordingly. The mass clamp (A) will be connected to the remaining pole (B).
Electric powerThe diameter of the electrode and the thickness of the workpieces tell you how much power (in amp A) you need to adjust your workstation (C). If you are a novice welder, do not reduce the intensity... If you take insurance, do not increase it. In both cases, the operation will be counterproductive, and the work will be all the more laborious.
Prepare the welding machine
- Install the electrode in the electrode holder.
- Connect the electrode holder to the pole specified on the electrode label.
- Connect the ground clamp to the free pole.
- Adjust the electrical power according to the thickness of the metal parts to be welded.
Prime the bow
- Scrape the end of the electrode on the workpiece for a distance of 1 to 2 cm.
- When the arc starts, move the tip of the electrode 5 mm from the weld point.
- Bring the bow slightly closer, trying to keep a gap of 2 to 3 mm.
How to arc weld with a coated electrode
- Prepare the parts to be welded: the joints must be perfectly clean, degreased and deoxidized.
- Use a grinder or sandpaper.
- Hang the ground clamp in a location that is smooth enough to allow current to flow, and that will not interfere with welding.
- Prime the bow.
- Make the score by depositing a drop of filler metal at regular intervals. This keeps the assembled parts edge to edge.
- Use the welder's hammer to remove the slag.
- Remove this thick dark layer as you go.
- Finish with a wire brush. The weld bead appears brighter.
- Iron over the solder to recharge or extend.
- Resume the weld from the beginning.
- To make a regular bead, move the electrode continuously and hold it 2 to 3 mm from the pieces.
- An electrode makes it possible to produce a weld bead of approximately one third of the length of the electrode.
- Change the electrode as needed.
- Before continuing, remove the slag with the welder's hammer and then with a wire brush.
- Never heat the slag once solidified.
- Connect a new electrode.
- Resume the weld a centimeter higher to ensure the continuity and strength of the cord.