Render of two steel plates joined with a narrow milled tulip-shaped groove and blue weld area
Weld Joint Milling
PEMA LM, CM and EB Milling Machines
Longitudinal (LM), circumferential (CM) and edge beveling (EB) milling
PEMA LM, CM and EB machines mill weld joints for longitudinal and circumferential seams and plate edges. A milled semi-narrow groove cuts groove volume and welding time, and automatic depth control keeps the groove constant.
Manufactured byPemamek
Up to 140 mmCM milling depth
3 machinesLongitudinal, circumferential, edge
Semi-narrowMilled groove type
Auto depthConstant groove depth control
Overview
Milled grooves instead of thermal-cut bevels
Pemamek's milling machines prepare weld joints for circumferential and longitudinal welds. A milled semi-narrow groove reduces groove volume and total welding time, and deformation and stress in the part are lower. Automatic depth control keeps the groove constant.
In wind tower manufacturing, the outside is milled slightly past the completed inside weld to open the root, so back gouging is not needed. Only the inside bevel is oxy-cut, outside milling reduces defects, and the semi-narrow groove means less weld metal.
PEMA LM mills longitudinal seams, with integrated rollers to rotate the workpiece and milling of satellites in the same process. PEMA CM prepares circular seams and opens the root with a milling depth up to 140 mm. PEMA EB mills plate edges, with plate edge scanning to align the milling path.
Applications
Joint preparation tasks
The three machines cover the main joint preparation steps in heavy tubular fabrication.
Render of two thick steel plates with a wide conventional V-shaped bevel between them
Semi-narrow grooves
A milled groove with less volume, so less welding is needed to fill it.
Replacing thermal-cut bevels
Avoids oxy-cutting both bevels, welding both sides and arc gouging between welds.
Longitudinal seams
PEMA LM mills the longitudinal joint while integrated rollers turn the workpiece.
Circumferential root opening
PEMA CM mills the outside past the inside weld to open the root, with no back gouging.
Plate edge beveling
PEMA EB mills plate edges, with edge scanning to align the milling path.
Features
Machine features
- High-torque spindle on all three machines, optimised for thick materials
- Control system with automated working sequences and preset milling parameters
- PEMA LM: compact design, integrated rollers and milling of satellites in the same process
- PEMA CM: milling depth up to 140 mm and fast setup
- PEMA CM: movable with an overhead crane or forklift, with an interface to material handling
- PEMA EB: plate edge scanning for milling path alignment
- PEMA EB: conveyor system for plate loading
Benefits
What milling brings
Less groove volume and shorter total welding time
Lower deformation and stress in the welded part
Fewer defects thanks to outside milling
Only the inside bevel needs oxy-cutting, and back gouging is avoided
Constant groove geometry with automatic depth control
Preparing joints on thick sections?
Share your plate thicknesses, diameters and groove shapes, and our Machinery team will help you choose between PEMA LM, CM and EB.
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