Spray transfer, Mechanical Engineering

Spray Transfer

In a gas shield of argon or argon rich mixture [i.e., Ar+CO2 gas mixture containing more than 80 % argon] the metal transfer changes from globular to spray type as welding current is increased beyond the transition current. The current value at which the metal transfer mode changes from globular to spray is known as transition current.This type of transfer has a typical fine arc column and pointed wire tip associated with it. A very fine stream of droplets is projected axially through the arc. This mode of transfer is specifically called as streaming spray transfer. It occurs more readily with high resistivity, small diameter wires (eg. Austenitic stainless steel). The reduction in droplet size also accompanied by an increase in the frequency of droplet transfer. One important characteristic of spray mode of transfer is the "finger" penetration which it produces. The spray transfer mode can be used to weld any metal. However, applying the process to thin sheets may be difficult because of the high currents needed to produce the spray arc. Also the large weld pool produced due to the high deposition rate makes it difficult to use it vertical or overhead positions.

When CO2 is used for shielding, a globular to spray transition does not occur. Drops become smaller as the increases, but they are not at all axially directed. The spatter is more than that with argon or argon rich mixed gas shield.The spatter is minimised if "buried arc" technique is used. Buried arc technique involves using a low voltage for any given current, forcing the arc to locate within the cavity created by the arc force. Under this condition, most of the non axially directed droplets are trapped in the weld pool.

Posted Date: 9/17/2012 1:35:05 AM | Location : United States







Related Discussions:- Spray transfer, Assignment Help, Ask Question on Spray transfer, Get Answer, Expert's Help, Spray transfer Discussions

Write discussion on Spray transfer
Your posts are moderated
Related Questions
#question. Select a standard rolled steel I-section for the simply supported beam shown in figure below. Select an appropriate factor of safety and material strength. Include ref

A column of timber section 15cm x 20cm is 6 meter long both side being fixed. If the youngs modulus for timber is 17.5 KN/mm 2 , Evaluate: a) Crippling load and b) Safe load


CLASSIFICATION OF ARC WELDING POWER SOURCES As we have know, different  welding processes require different operating conditions & the power sources are also necessarily differen

Custom-Designed Lap Joint Flanges Practices relative to lap-joint flanges, that experience has shown will result in a level of damage tolerance, leak-tightness integrity, and g

Graphical simulation animation of a CAD system can be used to inspect the tolerance and interference of matching components of a product. It will be possible to precisely define


Water jet machining is an advanced method for cutting plates using a high-velocity water jet mixed with abrasive powder. The jet comes out of a nozzle A of diameter d and follows t

Disc clutch friction warpage: Place the disc clutch friction on the surface plate and check for warpage.

Explain the Semi-Automatic Extension of screw conveyor "Semi-Automatic Extension of screw conveyor as per the screed width by telescopic-tube" Procedure: The extension of