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Low spatter GMAW Ziralloy

IP.com Disclosure Number: IPCOM000248738D
Publication Date: 2017-Jan-03
Document File: 2 page(s) / 310K

Publishing Venue

The IP.com Prior Art Database

Related People

Steven R. Peters: INVENTOR

Abstract

Ziralloy 4 produces relatively large droplets in the spray mode. When these droplets separate, they produce a sizeable voltage depression. When these voltage depressions occur, the STT switch is opened to reduce the arc pressure during droplet transfer. After 1 to 2 ms, the switch is closed and the output is returned to normal.

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Invention: Low Spatter GMAW Ziralloy

Inventor: Steven R. Peters
Engineer, The Lincoln Electric Company

Summary of Invention:

Ziralloy 4 produces relatively large droplets in the spray mode.  When these droplets separate, they produce a sizeable voltage depression.  When these voltage depressions occur, the STT switch is opened to reduce the arc pressure during droplet transfer.  After 1 to 2 ms, the switch is closed and the output is returned to normal.

Description of problem solved:

Free flight transfer GMAW of Ziralloy tends to produce excessive spatter.  Among other things, metal transfer during free flight transfer is influenced by the electrode composition, welding current and welding voltage.  As noted above, Ziralloy 4 produces relatively large droplets in the spray mode.  The arc force due to the welding current, acting on such large droplets, tends to produce excessive spatter as the arc force pushes each droplet toward the weld puddle.  In order to reduce spatter when welding with Ziralloy, it would be beneficial to determine when droplet transfer occurs, and then reduce the arc current so that the droplet is not driven by the arc force toward the weld puddle or in various undesired directions.

Shorting type transfers do not produce enough heat to joint thicker sections of the metal.  This eliminates short arc, controlled globular, wire retract (CMT or CSC to name two).

System Figure(s)

At 500 ipm wfs, 200 amps under 50/50 argon helium, I noticed a signatur...