Orbital Weld Preparation: Cutting, Facing and Tungsten

Treat tungsten preparation as a controlled setup item

Use the electrode type, diameter, tip geometry and installation specified for the approved process and head. Keep the preparation method consistent and protect the electrode from contamination. If the electrode touches the weld pool or another contaminated surface, assess and restore its condition before comparing the next sample.

Do not introduce a universal tip angle or replacement interval across unrelated current ranges and materials. Define the acceptable electrode condition in the setup instructions and train the operator to recognize when it has changed. Include electrode position and arc gap in the trial record.

Similarly, identify whether the cut end is already suitable or needs facing, deburring and cleaning. A useful demonstration begins with raw stock and ends with an accepted weld-ready joint, making the contribution of each preparation tool visible. This avoids buying a welding machine while leaving the main source of variability upstream.

Control the end face before changing the weld program

Cutting, facing and beveling perform different jobs. Cutting separates the workpiece at the required length. Facing squares the end and removes unevenness that would disturb fit-up. Beveling creates the groove geometry needed for a prepared, usually thicker-wall joint. Purchasing a cutting machine does not remove the need to verify the final end condition required by the welding procedure.

For a thin-wall autogenous butt joint, inspect squareness, burrs, cleanliness, roundness and alignment before loading the head. A visibly small burr can prevent the ends from meeting evenly. An angled cut can create a gap that changes around the circumference. Correcting current to overcome that local gap may overheat the rest of the joint. Keep the preparation method consistent across samples and production, and protect finished ends from handling damage.

For a prepared open-head joint, follow the specified groove angle, land, root gap and alignment. These dimensions must come from the joint procedure, not from a generic example copied from another pipe size. Confirm that the preparation tool can clamp the actual pipe and leave enough room for subsequent welding. Support long workpieces so that the cut or bevel does not become the point carrying their weight.

Record the preparation tool, blade or insert condition, and any secondary facing step during a trial. If weld results vary, this record helps distinguish a preparation change from a program problem. A repeatable weld starts with a repeatable joint, so end preparation should be part of the equipment package and operator training rather than an unmeasured activity upstream.

Match CM cutting capacity to the preparation requirement

CM3, CM4, CM6, CM8 and CM12 are different machine size classes. Their current listed OD ranges are 6–76.2 mm, 12–120 mm, 16–171 mm, 55–228 mm and 140–330 mm respectively, with a listed wall range of 1–5 mm. The overlapping ranges offer choices, but they do not mean that one compact frame handles the whole family. Confirm material, blade, support and the required finish as well as OD.

Select the blade for the material and the actual cutting task. A blade family name alone does not establish compatibility with every machine, wall thickness or supplier's arbor. Confirm the relevant dimensions and the machine's blade specification before ordering consumables. Long tube stock needs support so that its weight does not distort the clamping or the final part of the cut.

Inspect sample cuts for squareness, burrs, deformation and handling damage. Check whether the result meets the downstream welding fit-up requirement or whether a facing step is still needed. The PF range is intended for end-facing preparation; choose its fixture and blade by the actual tube and finish requirement. Larger prepared pipe joints may require a separate beveling route rather than a cutting-only machine.

Time the preparation sequence from loading stock through removal of a weld-ready part. Include blade changes, size changes and inspection. This shows whether cutting, facing or cleaning will constrain welding output. It also produces a useful purchase specification: a confirmed machine range, appropriate consumables and an agreed sample finish, rather than a model number chosen only from nominal inch labels.

Where FXT20 and C-series enclosed heads fit

FXT20 with a C-series head is an enclosed, autogenous TIG system for tube butt joints. The standard family covers actual OD 6.35–168 mm and wall thickness 0.5–3 mm across different heads; every individual head has a narrower rating. The listed heads are C5, C10, C40, C80, C120 and C170. Select the head and its collets from the actual tube dimensions, then check whether the head can be installed and removed at the intended joint.

Autogenous welding melts the parent material without adding filler wire. That makes a consistent end face and fit-up especially important: there is no added wire to compensate for a poorly prepared gap. The enclosed chamber protects the outside of the hot joint with argon. It does not eliminate the need to establish the required protection inside the tube. Material, purge arrangement and inspection criteria still belong in the procedure review.

The FXT20 power source uses single-phase 220 V input and provides 5–200 A DC output. C5 is air-cooled; C10, C40, C80, C120 and C170 are water-cooled. The host itself is air-cooled, with an internal tank and pump supplying the water-cooled head circuit. These are separate cooling functions. Tube OD 3.175 mm is outside the standard range and requires a paid custom assessment of control precision and current capability. Do not treat a headline family maximum or a custom enquiry as the standard rating of every head.

Validate representative joints before releasing production

Use sample joints that represent the intended materials, wall thicknesses and access conditions. A convenient straight tube on a bench may be useful for initial setup, but it does not establish that a crowded assembly or a prepared field joint is ready for production. Include the smallest and largest relevant dimensions and any geometry that changes clamping, gas protection or operator access.

Agree the acceptance plan before the demonstration. Identify who reviews external and internal appearance, dimensions and the required tests. Where a project uses a welding procedure specification and qualification records, align the trial with those requirements. A stored machine program is an instruction to the controller; it is not itself a qualified welding procedure or an approval certificate.

Capture the starting condition as carefully as the finished bead. Record material, end preparation, fixture, electrode setup, gas arrangement, power-source version and program revision. If a test fails, classify the observed problem and change one relevant variable at a time. Repeat with a fresh sample and keep the comparison. This approach is more informative than adjusting several settings until one attractive bead appears.

Before production release, repeat the accepted setup over a representative sequence so that handling, cooling, consumable condition and record collection are exercised together. Include head removal and access to the next joint. The result should be an executable setup sheet and an inspection agreement, not simply a successful photograph. Automation improves repetition when the inputs are controlled; it does not remove the need to establish those inputs.

PF end-facing models and recorded clamp sizes

Practical questions

Does a cold cut always remove the facing step?

No. Inspect the resulting squareness, burrs and fit-up against the welding requirement before deciding whether facing is necessary.

Should every pipe end receive the same bevel?

No. Thin-wall autogenous joints and prepared filler-wire joints need different end conditions, as specified by their procedures.

How should electrode life be estimated?

Measure it during the actual job trial and define replacement by condition and the process requirement. Do not transfer an interval from an unrelated demonstration.

Discuss your joint and equipment configuration

Send FYID-Feiyide the actual outside diameters, wall thicknesses, material grades, joint drawing, available working space, site voltage and inspection requirements. Include the expected production mix and any sample-test requirement so the head, tooling and operating workflow can be reviewed together. Contact our team, or compare the system selection guide and model specification tables.