Ferry Press Releases. 1  Monday, April 10, 2017: Hatteras-Ocracoke Spring Ferry Schedules Begin Tuesday. 2  Tuesday, April 04, 2017: M/V Sea Level Runs Soft Aground Near Ocracoke. 3  Thursday, January 12, 2017: 2017 Hatteras Vendor Priority Passes Still Available.
Both electrodes focus current at the same point to make a spot weld. Draw a high current for spot welding, according to the thickness and type of medal. Spot welding may require up to 90,000 amperes for thick pieces of aluminum. Maintain the current for a specific period of time.Weld times in spot welding can vary from 0.01 seconds to 0.63 seconds, depending on the metal thickness. Spot welding may be used on extremely thin pieces of metal, up to 1.25-inch metal plate.oth electrodes focus current at the same point to make a spot weld. Draw a high current for spot welding, according to the thickness and type of medal. Spot welding may require up to 90,000 amperes for thick pieces of aluminum. Maintain the current for a specific period of time.
7. When welding out of position (vertical, horizontal, or overhead welding), keep the weld pool small for best weld bead control, and use the smallest wire diameter size you can. 8. Be sure to match your contact tube, gun liner, and drive rolls to the wire size you are using.9.. Clean the aluminum before welding, to remove the oxide layer. Use a stainless steel wire brush used only for cleaning aluminum. 5. Fill the crater at the end of the weld to avoid a crack. One way to do this is to dwell in the weld pool for a second at the end of the weld.