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The slag in the welding process protects the weld from oxidation and slows down the rate at which the weld cools. It also prevents brittleness of the metal.
because a thin-protective layer of slag is formed over the molten metal
You have to clean the beak of the soldering iron with a sandpaper before pressing the tip of the welder on the wire. Heat it up (the wire) first, by pressing the tip of the welder on it) and only afterwards place the tin on the wire. [This answer pertains to soldering not welding.] In the welding process incomplete fusion occurs when the weld does not fuse with the base metal and can be caused by #1 travel speed too slow which allows the weld to roll over the edges trapping slag between the weld and the base metal. #2 amperage set too low which doesn't allow complete melting of the base metal, the weld deposit, and/or the flux/coating/slag. #3 electrode angle wrong which pushes the weld metal over the slag. #4 amperage setting too high and/or travel speed too fast which undercuts the edge of the base metal allowing slag to be trapped there and subsequent passes to bury the slag. #5 incorrectly placing the beads in multiple passes leaving voids along the edges that subsequent passes do not penetrate and remove. #6 arc length too long allowing weld to be deposited randomly. These answers relate to SMAW (stick welding) but some can be addressed in other processes. Other factors may apply to this problem in any of the welding processes. If you are reffering to a different process please ask again and specify which process.
slag is iron silicate (FeSiO3) while Matte is a crude mixture of molten sulphides.
Metals are extracted from their ores which contain several impurities, the lighter impurities are removed by slag formation.
The slag in the welding process protects the weld from oxidation and slows down the rate at which the weld cools. It also prevents brittleness of the metal.
Welder slag is a byproduct resulting from the welding process, often forming a layer on top of the welded joint. It consists of the residue from the flux used in the welding rod or wire, which helps protect the weld pool from impurities and contaminants while it cools. Slag is typically removed after welding to inspect the quality of the weld and ensure proper fusion.
In (SMAW) Shielded Metal Arc Welding 'stick welding': Flux is the substance added to to molten metals to bond with impurities that can be readily removed. Slag is the waste material which is removed.
Laying on hot metal, or having slag fall on it.
A welding chipping hammer is a hand held tool, like yourself. It is used for removing slag after the SMAW or flux core process.
One would be FCAW. Flux Cored Arc Welding.
what is normal welding electrode and how it welds
Slag is normally seen as elongated lines either continuous or discontinuous along the length of the weld.
Sparks from welding slag and not having a fire extinguisher nearby.
Slag is the residue left on a weld bead from the flux. It shields the hot metal from atmospheric contaminants that may weaken the weld joint. Slag can also be globules of molten metal that are expelled from the joint and then re solidify on the metal surface. in either case, they are usually chipped away with a slag hammer.
Correct current,travel speed, electrode angle, arc length
because a thin-protective layer of slag is formed over the molten metal