No, titanium does not have to be welded in a glovebox; it's been welded outside gloveboxes for over 30 years. To help ensure quality welds and avoid contamination, use separate grinding and shielding tools.
The shielding gas should be supplied until the molten weld is below 800°F to prevent air contamination. During GTAW and GMAW, argon or helium shielding gases with a dew point below –50°F provide the required protection. Separate gas supplies are required for the primary shielding of the molten weld puddle, secondary trailing shield to cool the weld deposit and associated heat affected zone (HAZ), as well as a backside weld shield for the HAZ. Argon is generally preferred over helium due to its higher density, better arc stability and cost advantages. Argon-helium mixtures may be used if higher voltage, hotter arc and greater penetration are desired. Helium, with its lower density, is sometimes used for a trailing of back-up shielding when the weld is above the device.
An Air Products representative can help you select the gas or gas mixes to meet your needs. Go to www.metalsassessment.com for best practices.
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