Page 33 - MetalForming-Sep-2018-issue

Welding Well
SOLUTIONS FOR QUICK DIE CHANGE
The large, all-copper conductive path of nonthreaded consumables increases arc stability and keeps tips cooler to extend tip life. Also, notice the shielding gas ports on the tip, which help keep it cooler.
with different shielding gases. “Pure CO2 is a reactive gas that provides deep penetration but produces less stable arc and more spatter,” he says, “while mixed CO2 with a higher argon content produces more-stable arc, reduced spatter and allows the use of spray transfer process for higher productivity and better-looking weld beads. Appli- cation variables always influence gun selection.”
Resistance, Good and Bad
GMAW contact tips come in two basic styles. A traditional copper tip has threads and screws into a brass diffuser, which then connects to a cop- per conductor tube. Nonthreaded cop- per contact tips seat directly into the end of a copper conductor tube; a screw-on nozzle holds them in place but is not part of the conductivity path. Threaded tips cost 50 percent less to purchase due to a simpler manufac- turing process, while nonthreaded tips offer two to 10 times longer life (depending on the weld-transfer mode and type of welding wire) and produce a welding arc that is more stable.
“Threaded tips inherently have poor- er electrical and thermal conductivity. Only a fraction of the surface makes contact with the diffuser threads, and brass is 28 percent as electrically con- ductive as pure copper,” explains Khalid Hassan, principal engineer, for Esab. “Poor electrical conductivity increases
• Die carts on rails
• Double die carts
• Die posioners
• Custom die change systems • Clamps- roller bars
• Bolster extensions
Hydraulic roller bars
Dual push-pull
CLAMPS DIE TABLES DIE TRANSFER
Clamps
SERAPID | +1 (586) 274-0774 | info-us@serapid.com | www.serapid.com
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High Precision Guide Elements
Preloaded high precision guide systems for stamp and mold tooling allows for tighter tool clearances, more stability and lower cost of maintenance.
Greater Accuracy Added Stability Lower Maintenance
AGATHON Machine Tools, Inc
9 Parklawn Drive Bethel, CT 06801 Tel: 203-730-8741
mailamt@agathonusa.com
www.agathon.com
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