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Why must the current be adjusted for a particular welding operation?
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Why is a welding machine not adjusted when a welder is welding?
two reasons i can think of: 1 - Probably dont need to, usually welding material of constant thickness. 2 - The transformer is mechanically adjusted on most welders, this means that that there would be a possibility for electricity jumping in the transformer, and premature failure, or fire.
Explain the principle behind arc welding.?
Arc welding uses an electrical current to create enough heat to melt metal. Any type of welding that uses an electric arc is technically arc welding. However, most people use the term 'arc welding' to mean shielded metal arc welding (SMAW), or 'stick welding'. SMAW, MIG, and flux core wire welding use the filler metal as both electrode and filler; TIG welding uses an electric arc to heat the base metal and a separate filler rod to add metal to the weld.
What is Limitation of gas welding?
what are gas welding limitation
What is the difference between arc welding and resistance welding?
in arc welding only heat is used to weld metal. but in resistance welding pressure will also be used along with heat.
What are welding sparks called?
The 'welding sparks' that come off during welding are metal particles from the filler metal, electrode, or base metal that are lost during welding. The standard term is spatter.
What is used in welding?
A device that can generate heat. Melted material and the welding operation is performed.
What are the factors affecting welding operation?
The factors are: Travel speed,Current too high,Arc length,Incorrect amperage setting and Electrode size.
Why is a welding machine not adjusted when a welder is welding?
two reasons i can think of: 1 - Probably dont need to, usually welding material of constant thickness. 2 - The transformer is mechanically adjusted on most welders, this means that that there would be a possibility for electricity jumping in the transformer, and premature failure, or fire.
What is the purpose for welding with direct current?
spot welding is one reason
What is the term tw refers to in welding?
TW = thermite welding, a welding process that requires no external source of heat or current.
Where you get welding objective type question and answer?
welding current for 2mm thick. ms plate
What is current adjusting wheel of an welding machine?
Regulating the medium of welding according to the needs
How does a welding transformer work?
A welding transformer uses the alternating current supplied to the welding shop at a high voltage to produce the low voltage welding power
How is current controlled in welding transformer?
in welding machine, the transformer used is basically a current transforrmer. so by changing the tap of secondary side of transformer, we can increase or decrease the current in the transformer.
What is a general formula for welding output current and voltage relationship for MMA welding machines?
V= 0.05 i + 10 for mmaw welding v= 0.05 i + 20 for tig welding
What is polarity in welding?
Polarity in welding has to do with the direction of the current in the welding process. With direct current (DC) the welding circuit can either be straight, or reverse polarity. When the machine is set for straight polarity, the current flows from the electrode to the weld surface and creates considerable heat in the metal. When the machine is in reverse polarity, the current is backwards and is flowing from the metal to the electrode causing a grater concentration of heat at the electrode.
What component of a welding machine changes AC current to DC current?
Yes, it is normal for a welding machine to convert AC voltage to a DC voltage.
