Page 57 - CITS - Welder - Trade Theory

WELDER - CITS

(Direct Current (Negative Polarity DC)

(Direct Current (Positive Polarity DC+)
Applications

1 Straight polarity (DCEN) (DCSP)
• In GTAW (TIG), Micro plasma welding DCEN results in low heat input into the work piece, which is
advantageous for faster welding speeds and better fusion, especially on thin materials.

• Which is beneficial for welding thin materials and for welding non-ferrous metals like aluminium, copper,
and stainless steel.
2 Reverse polarity(DCRP) (DCEP)
• In SMAW, DCEP provides deeper penetration into the base metal, making it suitable for welding thicker
materials.
• In GMAW, MIG, Co2 welding, Submerged welding (SAW), DCEP allows for better arc stability and improved
control over the weld pool.
• In DCEN provides better penetration and weld bead profile, making it suitable for welding thicker materials
and for outdoor welding where wind can blow away shielding gas.

Alternating Current (AC)

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CITS : C G & M - Welder - Lesson 10&11