Page 164 - CITS - Welder - Trade Theory

WELDER - CITS

Fig 4

Model of metal transfer - Dip or short circuiting, transfer,

Spray transfer (free fight transfer) and Globular transfer
(intermitted transfer) and applications

Objectives: At the end of this lesson you shall be able to
• describe the modes of metal transfer spray transfer
• explain the modes of metal transfer globular transfer
• explain the modes of metal transfer short circuit transfer.

Types of metal transfer: In GMAW/CO2 welding process, the weld metal is transferred from the electrode wire
to the base metal in different methods/modes. Though there are many methods, only the following four methods
are used popularly used in industries.
a Spray transfer (Free flight)
b Globular transfer (Intermediate)
c Short circuit or Dip transfer
d Pulsed transfer
The type of metal transfer that occurs will depend on the electrode wire size, shielding gas, arc voltage and
welding current.

Fig 1

151

CITS : C G & M - Welder - Lesson 49 - 60