Consumable electrodes actually form the filler metal of a weld. Stick and wire are examples of a consumable electrode. TIG on the other hand only produces the arc for the weld, and the filler metal is fed into it. The tungsten (the electrode) of a TIG torch does
not enter the weld.
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consumable is when the rod or other metal is also used up in the weld, like common mig welding. Non consumable would be like forms of tig welding that don't use any rods or other metals to join the 2 materials together
When you weld with electrodes, you are heating the edges of the workpiece to their melting point then adding "filler" metal to the weld to make it stronger. A consumable electrode provides both heat and filler metal; a non-consumable electrode requires the welder to add filler metal from another source. Non-consumable electrodes are used in the TIG process; consumable electrodes are used in shielded metallic arc welding (stick welding), flux-core arc welding ("wirefeed" welding without shielding gas) and MIG welding (wirefeed with shielding gas).
in consumable electrode we use rod,but in non-consumable electrode we don,t use any rod aor metal to join pieces.