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AC (Alternating Current) and DC (Direct Current) is used to describe the polarity of the electric current that the welder generates and in what direction it travels. If you use the wrong polarity for a certain welding rod, your weld strength will not be very good.
The general terms associated with polarity are reverse polarity and straight polarity. These are common to the welding trade. Another way to describe the two terms are electrode positive and electrode negative. Electrode positive is the same as reverse polarity. Electrode negative is the same as straight polarity. Hence the + and the - written on your welder where the cables connect to it.
Any type of welding rod you buy will be labeled as to what polarity should be used for welding with it. Using the correct polarity will ensure the proper penetration and the over all look of the final bead.
If you use the wrong polarity you can tell by the signs. There will be an excessive amount of spatter, you will have bad penetration, and you will have less control of your arc.
Some welding machines have a switch to adjust the polarity. If your welder doesn't have one you will need to switch the welding cables around where they plug into the machine. If you want reverse polarity, you need to make sure the electrode holder is plugged into the + terminal.
The easiest way to tell if you are using the wrong polarity is by the sound and the feel of the weld you are laying down. If you don't have much experience with stick welding you will have a little more trouble determining the difference. I have seen guys weld all day long with the wrong polarity. Then I would grab their welder to use for couple of minutes and I could tell right away. It all comes down to experience.
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What polarity is used for mild steel GTAW?
The only way to tig is to have your ground clamp hooked to the positive side of the welding machine. The negative lead will go to the tig torch. If it is reversed you will find out very quickly when you strike an arc. Most metals will be welded using this Polarity (straight). Most Aluminum TIG welding is performed using A C current.
In MIG welding what are the polarities of the torch and the work-piece and what is the fundamental reason for this?
MIG welding works only with reversed polarity, DC+, + at the torch. The reason is mostly the stability of the arc. Using DC- will result in a very unstable arc with lots of spatter.
Name the welding processes covered in this chapter which may use a shielding gas to shield the weld area?
Gas Tungsten Arc Welding Gas Metal Arc Welding Flux Cored Arc Welding
What are smaw welding?
smaw welding is sheilded metal arc welding
Difference between ERW and SAW welding?
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
What are the two polarities used with direct current welding?
reverse polarity and straight polarity The answer is right but a bit of furthur explanation is required. Polarity can be changed in DC output welding sets. The heat of the welding arc is concentrated on the positive terminal. So when thick plates are welded as more concentration of heat is required on the job the job is kept +ve ie. straight polarity is used. For thin plates concentration of heat is on the filler rod ,so reverse polarity is used.
What is polarity when the ground clamp is connected to the negative welding?
When the ground clamp is connected to the negative terminal during welding, this is known as DC electrode negative polarity. In this setup, electrons flow from the workpiece to the welding machine, creating a hotter arc and deeper penetration. This polarity is commonly used for welding processes that require higher heat input and faster travel speeds.
What is full form of ARC in arc welding?
The full form of ARC in arc welding is "Arc welding with Consumable Electrode."
What polarity is used for mild steel GTAW?
The only way to tig is to have your ground clamp hooked to the positive side of the welding machine. The negative lead will go to the tig torch. If it is reversed you will find out very quickly when you strike an arc. Most metals will be welded using this Polarity (straight). Most Aluminum TIG welding is performed using A C current.
In MIG welding what are the polarities of the torch and the work-piece and what is the fundamental reason for this?
MIG welding works only with reversed polarity, DC+, + at the torch. The reason is mostly the stability of the arc. Using DC- will result in a very unstable arc with lots of spatter.
What is the full form of arc welding?
If you are asking for the correct nomenclature it is Shielded Metal Arc Welding.
Where do you prefer arc welding?
Almost all welding today is done with electricity (Arc Welding) even on cast iron. SMAW, GTAW, GMAW etc. --AW means Arc Welding.
Does arc welding create ozone?
Yes, arc welding does create ozone. It is because the temperatures created during arc welding convert the nearby oxygen to ozone.
Name the welding processes covered in this chapter which may use a shielding gas to shield the weld area?
Gas Tungsten Arc Welding Gas Metal Arc Welding Flux Cored Arc Welding
What is full form of arc welding?
If you are asking for the correct nomenclature it is Shielded Metal Arc Welding.
What are smaw welding?
smaw welding is sheilded metal arc welding
Can you use LPG for ARC welding?
ARC welding uses large amounts of electricity to melt the metal, not a hot flame. So no, LPG cannot be used for ARC welding.
