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SDS & Learning

Training

Josef Gas provides training for all Propane uses.

Forklift Propane, Temporary heat Propane, Salamander use and Tar Kettle training courses are ALL available from our Training Services.

Components of the Welding Arc

mig-arc-diagram

The area of the welding arc is a region of high complexity that is comprised of physical forces and chemical reactions. The interaction of the components of the arc affects metal transfer and the quality of the finished weld. The behavior of the arc is influenced by:

  • The type and diameter of the filler metal.
  • The base metal conditions – clean or millscale.
  • The shielding gas.
  • The welding parameters – voltage and current.
  • The interaction of physical forces – gravity, surface tension, jet forces and electromagnetic
    force.

The character of the mode metal transfer, the penetration profile, and the bead shape are influenced by the forces applied to the metal as it moves from the electrode end to the work-piece.
Cross Section of a GMAW Arc

Short Circuit Metal Transfer

Pinch-Effect-during-Short-Circuiting-Transfer

Short circuiting metal transfer, is the mode of metal transfer where a continuous fed wire electrode is deposited during repeated electrical short circuits.

Short Circuit metal transfer is the low heat input mode of transfer for GMAW. To perform a suc- cessful short circuit transfer, using the correct shielding gas and wire diameter is imperative.

Typically this transfer mode sup- ports the use of .025 to .045 wire diameters with either 100% CO2, or a mixture of 75-80% Argon and 20-25% CO2. The low heat input makes this transfer ideal for sheet metal thickness ranging from .025” – .20” material.

Pinch Effect during Short-circuiting Transfer

Advantages

  • All position capability
  • Good for poor fit ups
  • Root pass capable
  • Low heat input reduces weldment
    distortion
  • Ease of use
  • High electrode efficiencies up to 93%

Limitations

  1. Restricted to sheet metal thicknesses
  2. Poor procedure control can result in excessive spatter and clean up cost

Training Articles

Safety Data Sheets

Download SDS information by clicking on the links below

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