WEEK 34

Ques 1. For TIG welding the applied electrode is mainly made of-

(a) tungsten

(b) nickel

(c) tin

(d) bronze

Ques 2. Which electrode is mostly used for welding of non-alloyed and low-alloyed steels as well as stainless steels.

(a) Pure tungsten

(b) Tungsten with 2% thorium

(c) Tungsten with 1% lanthanum

(d) Tungsten with 3% Zirconium

Ques 3. Which colour bands are used widely to indicate 2% and 1%

alloyed thoriated tungsten electrodes-

(a)blue & black colour band

(b) green & blue colour band

(c) pink & blue colour band

(d) Red and yellow colour bands

Ques 4. Which electrode is used in TIG welding process?

(a) ZINC Electrode

(b)Carbon Electrode

 (c)Tungsten

 (d)Magnesium Electrode

Ques 5. The electrode has turned blue, is contaminated with –

(a) oxygen and dis-integrates rapidly

(b) Nitrogen and will not dis-integrate rapidly

(c) hydrogen and dis-integrates rapidly

(d) Argon and dis-integrates rapidly

 Ques 6.Explain the types of tungsten electrode used.

Ques7.Define Grinding angle.

Ques8.Give brief description of GTAW electrodes.

Ques9.Give the name of  most frequently used metal oxides used for alloying
of tungsten .

Ques10.State the Electrode dimensions.