Tube Fabrication: Laser Cutting, Mandrel Bending and TIG Welding — Fudiesel FAQ

Two suppliers can quote the same exhaust or intake pipe at the same price and deliver different products, because the difference is in the process rather than the drawing. This page explains how Fudiesel fabricates performance piping and which process steps decide whether a part fits, flows and lasts.

Piping production runs at the group's metal pipe fabrication facility in Shanghai — a 107,639 sq ft plant working in aluminium, stainless steel and titanium, supported by more than 3,000 jigs for exhaust pipes.

What are the main steps in manufacturing a performance pipe?

Fudiesel production runs through a continuous in-house chain:

1. Laser cutting — cutting tube and plate to the required profile
2. Mandrel bending — forming bends without collapsing the tube wall
3. Accurate cutting — trimming to final length and angles
4. Punching — holes, slots and mounting features
5. Assembly — tacking and aligning components in fixtures
6. Full welding — TIG welding of joints
7. Polishing — surface finishing
8. Quality check, packing and warehouse

Each step happens inside the same facility, so no third party sits between fabrication and shipment.

What is mandrel bending and why does it matter?

Mandrel bending inserts an internal mandrel inside the tube while it is drawn around a die, which supports the wall through the bend. The result is a bend that keeps its cross-section instead of collapsing or wrinkling on the inside radius.

Why it matters for performance piping:

• A collapsed bend reduces flow area exactly where the pipe needs to flow best
• Wrinkled or crushed bends create turbulence and points where cracking can start
• Consistent wall thickness through the bend keeps pressure capability predictable

Pie-cut and welded bends are used in some applications for tight packaging or low-volume work, but a mandrel bend is the process of choice where flow and appearance both matter.

Why does Fudiesel use TIG welding for exhaust and intake piping?

TIG (tungsten inert gas) welding gives the operator control over heat input and filler placement, which suits thin-wall stainless steel and titanium where distortion and contamination are the main risks. Practical consequences for the product:

• Clean, controlled weld beads on thin walls
• Full-penetration welds at stressed joints rather than partial welds
• Titanium can be welded in-house without the embrittlement that comes from poor shielding

Fudiesel production uses full TIG welding, and the same facility works with aluminium, stainless steel, titanium and carbon fiber components.

How is the pipe geometry held consistent between the first part and the hundredth?

Through fixtures and jigs. Fudiesel designs and produces specialised jigs and fixtures for each part, which hold the components in position during assembly and welding so the geometry does not drift across a production run. The group maintains more than 6,600 jigs in total, including 3,000+ for exhaust pipes, which is also why many applications can be produced without cutting new tooling.

How does a new pipe design get from drawing to production?

1. Customer submits a drawing, sample or design concept
2. Fudiesel 3D scans the sample or reviews the drawing to capture geometry
3. The design is optimised for flow, fitment and manufacturability
4. A 3D printed prototype verifies the concept where useful
5. Jigs and fixtures are produced
6. A screw sample is supplied for installation and testing
7. Adjustments are made from the customer's feedback
8. Pre-delivery 3D scanning comparison verifies parts against the approved design

For new designs, engineers also run computer simulation in advance to reduce development risk.

Which materials can be fabricated?

• Aluminium — intake piping, intercooler components, tanks and fabricated parts
• Stainless steel — exhaust piping, headers, downpipes and resonators, produced in SS304 and other grades
• Titanium — Grades 1 through 4 for weight-critical piping and exhaust systems
• Carbon fiber — pipes and panel components, handled at the dedicated carbon fiber facility

Material standards used include GB, AISI, ASTM, DIN, EN and JIS for stainless steel coil, sheet and plate.

How is weld and dimensional quality checked?

Fudiesel applies inspection through the process rather than only at the end: material testing before production, in-process checks during fabrication and assembly, finished product inspection before packing, and quality traceability on production lots. Custom parts additionally go through the pre-delivery 3D scanning comparison against the approved design. Buyers who require third-party inspection before shipment can arrange it, and Fudiesel supports the inspection process.

What surface finishes are available?

The applicable finish depends on the material and the component, and Fudiesel confirms the available options for each part in the quotation.

Order terms for fabricated piping

Order quantities, sample policy and lead times are confirmed per part family in the written quotation, so pricing and scheduling stay accurate for the specific application.

How to start a fabricated piping project

Send the drawing or sample details, material, and the application to fudiesel@fupower.com or WhatsApp +86 199 0182 5634. Fudiesel will confirm whether existing jigs cover the part and quote accordingly.

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