PPAWM-24Aa/24Cb Automatic Pipe Spool Root Pass Welding Machine (DN50-600) | Qianshan, Shanghai, China

The PPAWM-24Aa/24Cb is an automatic welding machine for the root pass weld on pipe spool pieces. The root pass is the first weld pass at the base of a joint, and it has to be right, because it sets the quality of everything welded over it. The machine automates that pass using the FCAW, GMAW, or GTAW welding process.

It handles pipe from DN50 to DN600 (φ60 to 610mm) with wall thicknesses from 3mm to 30mm, in lengths from 400mm to 8,000mm. It welds carbon steel, alloy steel, stainless steel, and cryogenic steel, across all the joint types found in a spool: pipe to pipe, pipe to elbow, pipe to flange, flange to flange, and flange to elbow. A transition connection (a dummy pipe piece) can be used where needed.

The machine is controlled by a PLC with a text display. It has an electric cross oscillator driven by a stepper motor, with stepless adjustment of the weave (swing width, swing frequency, and left and right dwell times), which helps produce a consistent root bead.

Why Choose an Automatic Root Pass Welder?

Root pass quality is the most demanding part of pipe welding, and it's where manual welding varies most between welders. Automating it gives more consistent joints and reduces dependence on scarce skilled welders, which matters in petroleum, petrochemical, power, and shipbuilding pipework.

• Consistent root passes. The oscillator and controlled workpiece rotation give repeatable weld conditions.
• Adjustable weave. Weave width, frequency, and left and right dwell can all be set steplessly, with digital display.
• Wide range. DN50 to DN600 pipe and 3 to 30mm walls cover most spool work.
• Many joint types. Pipe, elbow, and flange combinations are all covered.
• Materials flexibility. Carbon steel, alloy steel, stainless steel, and cryogenic steel.

Machine Specifications

Capacity

• Pipe diameter: DN50 to DN600 (φ60 to 610mm)
• Pipe wall thickness: 3mm to 30mm
• Pipe length: 400mm to 8,000mm (for pipe diameters of 400mm or less, an auxiliary method is used for welding)
• Materials: carbon steel, alloy steel, stainless steel, cryogenic steel
• Welding lines: pipe-pipe, pipe-elbow, pipe-flange, flange-flange, and flange-elbow (with a transition connection if necessary)

Systems

• Welding process: FCAW, GMAW, or GTAW (root pass)
• Welding power source: OEM Chinese product, or as specified by the customer
• Control system: PLC with text display
• Clamping system: clamping arm moves up and down by screw
• Oscillating system: electric cross oscillator driven by a stepper motor, with stepless adjustment of swing width, swing frequency, and left and right pause time (button and digital display adjustment)
• Workpiece rotation: variable frequency, stepless adjustable (knob and digital display for rotation speed and welding speed)
• Cross arm extension: electrically driven, stepless adjustable (button control)

Condition Available: New

Key Features

• Automated root pass welding for pipe spools
• Three welding processes: GMAW, GTAW, and FCAW
• DN50 to DN600 pipe with walls from 3 to 30mm
• Five joint types: pipe-pipe, pipe-elbow, pipe-flange, flange-flange, flange-elbow
• PLC control with text display
• Electric cross oscillator with stepless weave adjustment
• Variable-frequency workpiece rotation with stepless speed adjustment
• Welds carbon, alloy, stainless, and cryogenic steel

Applications

• Root pass welding of pipe spools
• Pipe fabrication for petroleum, petrochemical, electric power, shipbuilding, and aerospace work (the industries Qianshan lists)
• Welding pipe to elbows, flanges, and other fittings

Who This Machine Is For

• Pipe spool fabrication shops
• Petrochemical, power, and shipbuilding pipework contractors
• Fabricators who want to automate the root pass and reduce dependence on skilled welders

Frequently Asked Questions

What does this machine do?
It automatically welds the root pass on pipe spool joints.

What pipe sizes can it handle?
DN50 to DN600 (φ60 to 610mm) pipe, with wall thicknesses from 3mm to 30mm and lengths from 400mm to 8,000mm.

What materials can it weld?
Carbon steel, alloy steel, stainless steel, and cryogenic steel.

What joints can it weld?
Pipe to pipe, pipe to elbow, pipe to flange, flange to flange, and flange to elbow. A transition connection can be used where necessary.

What welding processes does it use?
FCAW, GMAW, or GTAW for the root pass.

Can the weave be adjusted?
Yes. An electric cross oscillator gives stepless adjustment of swing width, swing frequency, and left and right pause time.

What welding power source is included?
The page says an OEM Chinese power source, or one specified by the customer, so you can ask for a preferred brand.

Is financing or staged payment available?
Yes. A deposit secures your order and begins production, with the remaining balance due only once your machine has been built, inspected, and is ready to ship.

Should I buy new or used?
This model is available new, built to order.