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After cutting, the tube end must be square, burr-free, and flat to gap tolerance before orbital welding. LPM finishes small stainless tube ends — 0.125″–1″ OD — to the fit-up quality that closed-head TIG orbital welding requires.
Closed-head orbital TIG welding (FXT20 + C-series) requires both tube ends to mate with a gap of ≤ 0.1mm and with no perceptible step misalignment. A gap larger than this causes the molten root bead to collapse or bridge incompletely, producing a concave root or a cold lap at the weld toe. A non-flat or non-square tube end face creates an uneven gap that varies around the circumference, which causes arc-length and heat-input variation that the machine’s automatic parameter control cannot fully correct.
The CM series planetary cutter produces a cold-cut end face with good perpendicularity, but the surface finish may retain fine burrs or micro-ridges from the cutting blade. LPM faces the tube end flat with a controlled, repeatable process: a rotating carbide-tipped tool trims the face to a flat, burr-free surface that achieves the fit-up gap tolerance required for high-quality autogenous orbital welds.
LPM is particularly important in semiconductor EP piping and pharmaceutical WFI / CIP systems where weld-root quality is a cleanroom or GMP validation requirement. A concave root or incomplete fusion at the root is a particle trap or a bacterial harbor — neither is acceptable in these applications.
Semiconductor special gas delivery systems use φ6.35–12.7mm 316L EP-grade stainless tube. The LPM produces the burr-free, flat end face that prevents particles at the joint. After LPM facing, the tube end enters the FXT20 + C5 / C10 welding head.
GMP pharmaceutical piping requires smooth, flush weld roots. The LPM-prepared end face ensures the orbital weld root fully fuses at 0 gap, producing the flush interior surface required by 3-A sanitary standards and FDA / EU GMP audits.
High-purity gas and fluid instrumentation tubing (φ3.175–25.4mm) in laboratory and R&D facilities. LPM covers the full ⅛″–1″ OD range used in analytical instrument gas and liquid lines.
