ASME IX - Contact Tube to Work Distance
ASME IX - Contact Tube to Work Distance
(OP)
Does the variable "contact tube to work distance" apply to GTAW welding, or is this only applicable to GMAW or other processes?
Is there a place on a GTAW WPS that you specify the distance of the tungsten tip to the work surface?
Is there a place on a GTAW WPS that you specify the distance of the tungsten tip to the work surface?





RE: ASME IX - Contact Tube to Work Distance
RE: ASME IX - Contact Tube to Work Distance
Where as in GMAW/SMAW there is. Ok answered my own query.!
cheers,
RE: ASME IX - Contact Tube to Work Distance
Simplified. Arc Gap in GTAW is not required to be controlled by ASME Section IX.
It is good practice to include the arc gap as a reference variable on the WPS in a supplementary notes section, particularly with Automated or Semi-automatic welding. For manual welding, it all comes down to the skill of the operator.
RE: ASME IX - Contact Tube to Work Distance
RE: ASME IX - Contact Tube to Work Distance
Definition of contact tube per ASME IX:
contact tube: a device which transfers current to a continuous
electrode.
One can argue that since the collet body meets this definition in transferring current to the tungsten, that it would indeed be considered a "contact tube."
QW-256 disagrees however, and is quite clear in that regard. And, since the filler wire isn't considered the electrode, it can't even apply to a hot-wire GTAW setup.