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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.
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Why is oxidizing flame desirable in welding of copper alloys?
because a thin-protective layer of slag is formed over the molten metal
What is and what causes Incomplete Fusion in welding?
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.
What is difference between slag and matte?
slag is iron silicate (FeSiO3) while Matte is a crude mixture of molten sulphides.
Why slag is produced in metal extraction?
Metals are extracted from their ores which contain several impurities, the lighter impurities are removed by slag formation.
What is the gas for welding?
Oxygen and acetylene for flame welding. Argon for Tig welding CO2 for MIG welding steels Argon for MIG welding aluminum TRI-mix for robotic mig of steels. And helium is added for some overhead welding.
What is welder slag?
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.
What do mean by flux and slag?
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.
What causes welding hose to be charred?
Laying on hot metal, or having slag fall on it.
What is a welding chipping hammer?
A welding chipping hammer is a hand held tool, like yourself. It is used for removing slag after the SMAW or flux core process.
What are the two american welding society abbreviations for the arc welding processes that melt a tubular electrode with alloys deoxidizers and slag formers in their cores?
One would be FCAW. Flux Cored Arc Welding.
What are the most common causes of fire on a constrution site?
Sparks from welding slag and not having a fire extinguisher nearby.
Slage inclusion welding defect?
Slag is normally seen as elongated lines either continuous or discontinuous along the length of the weld.
What is slag from welding?
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.
How would you avoid accurence porosity or slag on weld?
Correct current,travel speed, electrode angle, arc length
Why is oxidizing flame desirable in welding of copper alloys?
because a thin-protective layer of slag is formed over the molten metal
How do you prevent the occurrence of slag inclusion and undercut?
The following techniques can be used to prevent slag inclusions: Use welding techniques to produce smooth weld beads and adequate inter-run fusion to avoid forming pockets to trap the slag. Use the correct current and travel speed to avoid undercutting the sidewall which will make the slag difficult to remove.
What is the use of up hill welding and down hill welding?
Vertical up welding is preferred in most instances as better penetration is achieved and the slag does not run down into the arc. Down hand welding is mostly used on thin material so as not to burn thru the metal. Travel speed is usually increased also.
