Electric Arc Welding with generic Features:By using Electric Arc,If the heat required for melting of plates is obtained called as Electric Arc Welding operation.The setup consists of electrode,Work piece and power supply.This post focus about the detailed explanation of Electric Arc Welding with generic Features.
Explanation of Electric Arc Welding:
- When the power supply is given and optimum gap is maintained between Cathode and Anode,the very high velocity negatively charged electrons will be generated at the cathode.
- These will be attracted by the anode and moving towards the anode.When these very high velocity negatively charged electrons are impinging on to the anode,the Kinetic Energy of electrons is converted into Heat energy.
- Therefore,the heat generation is taking place at the anode.
- Simultaneously,the Positively charged ions also will be generated at the anode which is attracted by the cathode and moving towards the cathode.
- When these high velocity ions impinging on to the cathode,the Kinetic Energy of ions is converted into Heat energy.
- Therefore,heat generation is taking place at cathode also.
The ratio of Heat generation between the cathode and anode is given as follows.
Heat Generation of Cathode:Anode=2:1
Spark Zone in Electric Arc Welding
- During flow of electrons and ions,some of them may get collided in between the path so that the Kinetic Energy possessed by both the elements is converted into heat energy.
- This spontaneous release of heat energy will induce the sparkling and in the spark zone the temperatures induced are very high which is about 5000°C-6000°C.
- This high temperature zone will produces UV rays.Hence the Electric Arc Welding Zone must be seen only through safety goggles to safeguard the human eye.
Abbreviations in Electric Arc Welding process
- DCSP-Direct Current Straight Polarity
- DCEN-Direct Current Electrode Negative
- DCRP-Direct Current Reverse Polarity
- DCEP-Direct Current Electrode Positive
- ACHF-Alternating Current High Frequency
Features of Electric Arc Welding Process:
- In DCSP,because of higher heat generated at the work piece,high Melting Point metals and higher thickness plates can be welded very easily and depth of penetration is also higher.
- Because of lower heat generated at the electrode,melting rate of electrode is low,deposition is low hence welding speeds are possible.
- In DCRP,because of lower heat generated at the work piece,only low Melting Point metals and lower thickness plates can be joined and depth of penetration is also low.
- Whereas in case of electrode,because of higher heat generated at the electrode,the melting rate of electrode is high,the deposition rate is high.Hence higher welding speeds are possible.
- In ACHF,heat generation is 1:1 ratio.Hence,this can be used for medium conditions and depth of penetration is also medium.
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