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WHAT IS THE DIFFERENCE BETWEEN AC AND DC WELDING?

A.C . 

WELDING 

☆ONLY  WELDING  TRANSFORMERS IS REQUIRED  CHEAPER .

☆ EFFICIENCY  OF TRANSFORMER  IS 80 TO 85%.

☆ ZERO CURRENT  TWICE IN EACH  TEMPERATURE. 

☆ EQUIPMENT  COST IS LOW.

☆ LESS SPACE  REQUIRED  

☆ USE OF  INTERMITTENT  CURRENT  REDUCED  ENERGY  CONSUMPTION. 

☆COATED ELECTRODE  IS USED.

☆ SPEEDLY WELDING  WORK.

AC and DC welding are forms of arc welding that use different currents to produce an electric arc. ... The electric arc provides heat to fuse the metals together. A power supply is used to generate the arc, which can either use an alternating current (AC) or a direct current (DC).

Advantages

The advantages of AC welding are:

• The alternating current between positive polarity and negative polarity allows for a steadier arc for welding magnetic parts
• Fixes problems with arc blow
• Enables effective aluminium welding
• AC welding machines are cheaper than DC equipment

Disadvantages

The disadvantages of AC welding are:

• More spatter
• Weld quality is not as smooth as with DC welding
• Less reliable and therefore more difficult to handle than DC welding

Applications

When switched to AC positive, it also helps remove oxide from the metal surface - hence it is suitable for welding aluminium.

AC welding is also widely used in shipbuilding, particularly for seam welds, as it has the ability to set the current higher than with DC. AC welding also offers fast fills and is used for down hand heavy plate welds.

One of the main uses of AC welding is with materials that are magnetised. This makes it useful for repairing machinery. 

D.C WELDING  ◇

◇  MOTOR GENERATOR  SET OR OIL ENGINE  GENERATOR  SET  IS    REQUIRED  COSTLY .

* EFFICIENCY  OF  MOTOR  GENERATOR SET  IS 60 TO 65%.

* UNIFORM  TEMPERATURE  DURING  ENTIRE  PROCESS .

* EQUIPMENT COST IS  HIGH .

□ MORE  SPACE  AS COMPARED TO  A C SYSTEM IS REQUIRED .

☆ CONTINUOUS  USE D.C GENERATOR  SET  COSTS MORE.

☆ BOTH COATED  AND  UNCOATED ELECTRODE  CAN BE USED. 

● NORMAL  WORKING  SPEED.

Advantages

The advantages of DC welding are:

• A smoother welding output than with AC
• A more stable arc
• Less spatter
• DC negative offers faster deposition rates when welding thin sheet metals
• DC positive provides greater penetration into the weld metal

Disadvantages

The disadvantages of DC welding are:

• DC welding is unable to fix arc blow problems
• Equipment is more expensive as DC currents require an internal transformer to switch the current

Applications

DC welding is ideal for joining thinner metals as well as being used in most stick welding applications, including TIG welding of - steels. This form of welding is also good for overhead and vertical applications.

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