Good FORUM: http://weldingweb.com
wiki How-to > helpful read to chose the correct electrodes
A rare trade with info on how to weld aluminium correctly.
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Extract from wiki 18 steps
(warning from my instructor: "never weld without protection gear on."):
Learn the steps for creating a successful weld. Welding is more than dragging a welding rod across a piece of steel and gluing it to another one. The process begins with properly fitting and securing the work pieces, or metal to be welded, together. For thicker pieces, you may want to grind a bevel so subsequent beads can be placed in the groove to fill it completely with a solid weld. Here are the basic steps for completing a simple weld.
- Strike the arc. This is the process of creating an electric arc between the electrode and the workpiece. If the electrode simply allows the current to pass directly into the grounded work piece, there will not be enough heat produced to melt and fuse metal together.
- Move the arc to create a bead. The bead is the metal from the melting electrode flowing together with molten metal from the base metal to fill the space between the pieces being joined by welding.
- Shape the weld bead. This is done by weaving the arc back and forth across the weld path either in a zig zag or figure 8 motion so the metal spreads to the width that you want your finished weld bead to be.
- Chip and brush the weld between passes. Each time you complete a pass, or trip from one end to the other of your weld, you need to remove the slag, or the melted electrode flux material, from the surface of the weld bead so only clean molten metal will be filling the weld on the subsequent pass.
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