Page 168 - Module DMV20173

EXERCISE 5.3

Identify the factors that control the efficiency of metal extrusion.

1. The type of extrusion.
2. The extrusion ratio.
3. The working temperature.
4. The speed of deformation.
5. The frictional condition.

EXERCISE 6.1

Describe the characteristics of Gas Tungsten Arc Welding (GTAW).

Process characteristic:
 Uses non-consumable tungsten electrode.
 Used shielding gases (Ar, He or CO2).
 Produce very high quality welds.

 No slag or spatter.
 Applicable to thin material.

EXERCISE 6.2

Brazing is widely used in industries because of its many advantages.
Describe any five (5) advantages.

Solution:
1. Dissimilar metals, such as stainless steel to cast iron can be joined by
brazing.
2. Because of lower temperature used, there is less distortion in brazed joint.

3. Because of the simplicity of the process, the joint can be quickly finished
without much skill.
4. The braze joint are reasonable stronger, depending on the strength of the
filler metal used.

5. Since the filler metal reached the joint by capillary action, it is important that
the joint is designed properly; the clearance between two parts should be
critically controlled.