PTA welding is a surprisingly sensitive process and takes constant operator attention; it requires numerous adjustments related to the position of the torch itself and the position of the weld bead
on a round surface.
This high basicity, neutral, agglomerated flux has been upgraded and now is especially suited for narrow gap welding because of its good slag detachability, concave weld bead
profile and smooth sidewall blending.
Compared to pure vibration welding, CVT produces a much cleaner weld joint characterized by a compact weld bead
, virtually no particulate, and distinct absence of "angel hair.
4) Overheating of tungsten electrode was observed when pulse on time was greater than 60%, where as when the pulse on time was less than 40%, it resulted in poor weld bead
A schematic representation for implementing the position GTAW Dressing weld bead
on the edge of GTAW welding.
In addition, the weld pocket recesses are designed to ensure there is no need for a pronounced weld bead
with the risk of friction grinding the bead down and weakening the weld.
Centrifugal force detaches the molten droplets and propels the weld metal angularly, creating a consistent and sound weld bead
However, due to the increased heat input, higher deformation of welded components and massive reinforcement of weld bead
was measured (Fig.
Cycle Time: The welding process cycle time significantly is longer with IR welding due to the rate that the materials can be consistently heated with radiation and their ability to conduct that heat deep into the molded weld bead
Porosity is contamination of weld metal caused by trapped hydrogen as moisture breaks down during heating, leaving round holes in the weld bead
It can also be said that the higher the heat input, the wider the weld bead
and the further away from the weld centre line is the WI.
This phenomenon is usually associated with insufficient weld bead
size or inappropriate shape, welding under excessive restraint or sometimes with material properties--such as high impurity content or a relatively large shrinkage on solidification.