Mechanical Engineering - Workshop Technology - Discussion
Discussion Forum : Workshop Technology - Section 1 (Q.No. 16)
16.
In welding copper alloys with TIG arc welding
Answer: Option
Explanation:
Direct current with straight polarity (DCEN) is used when TIG welding copper alloys, the electrode is positive and the workpiece is negative. This polarity is preferred when welding copper alloys because it creates a stable arc with a deep and concentrated heat at the point of contact between the electrode and the workpiece, which helps to achieve a consistent weld.
Discussion:
14 comments Page 1 of 2.
Prince said:
9 years ago
DCSP - ELECTRODE NEGATIVE, WORK POSITIVE.
DCRP- ELECTRODE POSITIVE, WORK NEGATIVE.
DURING TIG WELDING -
DCRP CANNOT BE USED AS ELECTRONS WILL FLOW FROM WORK TO ELECTRODE AND WILL HEAT THE ELECTRODE UNNECESSARILY. DCSP CANNOT BE USED FOR ALUMINIUM AND MAGNESIUM AS THERE WILL BE OXIDE FORMATION ON THE WORKPIECE WHICH DISRUPTS THE ELECTRIC ARC (because electrons will flow from electrode to workpiece).
So, for AL and MG only AC welding is used. For other materials, DCSP can be used such as FERROUS ALLOYS and COPPER ALLOYS as there oxides will not promotes further oxidation and will not disrupts the electric arc.
DCRP- ELECTRODE POSITIVE, WORK NEGATIVE.
DURING TIG WELDING -
DCRP CANNOT BE USED AS ELECTRONS WILL FLOW FROM WORK TO ELECTRODE AND WILL HEAT THE ELECTRODE UNNECESSARILY. DCSP CANNOT BE USED FOR ALUMINIUM AND MAGNESIUM AS THERE WILL BE OXIDE FORMATION ON THE WORKPIECE WHICH DISRUPTS THE ELECTRIC ARC (because electrons will flow from electrode to workpiece).
So, for AL and MG only AC welding is used. For other materials, DCSP can be used such as FERROUS ALLOYS and COPPER ALLOYS as there oxides will not promotes further oxidation and will not disrupts the electric arc.
(1)
SANGRAM SEKHAR SAHOO said:
1 decade ago
AC - used for non-ferrous metal except copper.
DC WITH STRAIGHT POLARITY - used for ferrous metal and also for copper.
DC WITH STRAIGHT POLARITY - used for ferrous metal and also for copper.
Prem said:
1 decade ago
DC with reverse polarity used for magnesium.
The AC is more versatile in welding for steel, cast iron, AL & Mg.
The AC is more versatile in welding for steel, cast iron, AL & Mg.
SANJAY said:
1 decade ago
In this used only DC current & strait polarity used for thin base metal.
Sanju said:
1 decade ago
And strait polarity for thin and low melting base metals.
Tushar said:
1 decade ago
DCSP is used for all metals except alloys of Al and Mg, for Al and Mg either DCRP or AC supply is used.
Vishal said:
10 years ago
Straight polarity means?
Bhargav said:
10 years ago
Reversed polarity means?
Rahul Urkude said:
10 years ago
DCRP: The work piece is connected to negative terminal and electrode is connected to positive terminal. The heat generation of work piece is high. High melting point material are easily welded.
DCSP: The work piece is connected to positive terminal and electrode is connected to negative terminal.
DCSP: The work piece is connected to positive terminal and electrode is connected to negative terminal.
Sekar said:
10 years ago
Straight polarity is used for TIG welding.
Reverse polarity is used for ARC welding.
Reverse polarity is used for ARC welding.
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