Swagelok 8HPH Series, User Manual

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14 Series 8HPH Weld Head User’s Manual
Operation
Preparing the Work
It is important to prepare the components properly before welding.
See Figure 18. Components must be square and burr-free to ensure
repeatable, high-quality autogenous fusion welds.
Follow these steps to achieve square and burr-free tubing:
1. Cut the tubing to length with a hacksaw or tube cutter.
2. Face the tube ends with a lathe or a portable facing tool.
3. Deburr the ends, making sure that both the inside and outside
diameters are square and burr-free.
4. Clean the tube ends using an appropriate solvent.
Minimize the chance of a poor quality weld by following these
guidelines:
• Tube ends must be square.
• Tube ends must not have a wall thickness variation exceeding
± 15 % of nominal.
• Tube ends must be burr-free.
• Tube ends must be free of any rust, grease, oil, paint, or other
surface contaminants.
Figure 18 Preparing the Tube
Method
Result
Burrs
Burrs in Flow Path
Burrs
End Rolled by Cutter
Blade and Roller
Irregular Tube
Diameter
Face Perpendicular
to Axis
Smooth Transition at
Wall Faces
Reduced Flow Area
Gap
Hacksaw Cut
Tube Cutter
Tube Facing Tool
Square corners No Gap
13-170.indb 14 2/1/13 1:45 PM