What are the four transfer modes used with GMAW?

There are four basic modes of transfer in the welding process: short circuit, globular, spray and pulsed spray. Selecting the proper mode of transfer depends on the welding process, welding power supply and consumable that is being used.

What are 4 transfer metal transfer methods in MIG welding?

In MIG welding, there are four different basic modes to transfer weld metal (filler material) across the arc to the base material. These transfer modes are Short Circuit, Globular, Spray Arc and Pulsed MIG.

What are the different modes of metal transfer in GMAW?

Three modes of metal transfer are possible with GMAW: short-circuiting transfer, globular transfer, and spray transfer. In addition, there is a variation of the spray transfer mode called pulsed spray.

What is GMAW spray transfer?

Metal transfer in which molten metal from a consumable electrode is propelled axially across the arc in small droplets.

What is the globular transfer method?

Globular transfer means the weld metal transfers across the arc in large droplets, usually larger than the diameter of the electrode being used. This mode of transfer generally is used on carbon steel only and uses 100 percent CO2 shielding gas.

What is dip transfer?

In short-circuiting or ‘dip’ transfer, the molten metal forming on the tip of the wire is transferred by the wire dipping into the weld pool. Inductance is used to control the surge in current which occurs when the wire dips into the weld pool.

What is spray transfer?

Spray transfer is named for the spray of tiny molten droplets across the arc, similar to spray coming out of a garden hose when the opening is restricted. Spray transfer usually is smaller than the diameter of the wire and uses relatively high voltage and wire feed speeds or amperage.

What is pulse transfer mode?

In pulsed transfer, the welding current is rapidly switched from a high pulse current to a low background current. This technique is shown by Fig. 2. The background current (Ib) serves primarily to sustain the arc but is insufficient for metal transfer.

Is Pulse MIG spray transfer?

Spray transfer: Named for a spray of tiny molten droplets across the arc, this mode uses relatively high voltage and amperage values. The arc is on at all times after the arc is established. Pulsed-spray transfer: This mode (often referred to as pulsed MIG welding) is a modified spray transfer process.

What is globular transfer?

3.14. 4 Globular Transfer. This type of transfer refers to the state of transfer between short-circuiting and spray-arc transfer modes. Large globules of wire are expelled off the end of the electrode wire and enter the weld puddle.