Friction Welding Machines

Automated Welding Systems for Electric Vehicle Parts, Batteries, Shafts, and Drill Pipes

LPR Global’s rotary friction welding machines minimize material loss and burr for automotive manufacturers by precisely controlling joining time, weld length and forging force.


Common applications include:

  • Joining e-mobility components such as EV battery terminals and motor shafts
  • Producing automotive parts such as camshafts, pistons, propeller shafts, engine valves, shock absorber rods, torque converters, and rear axle housings


We also provide CNC friction welding machines and hydraulic servo-driven machines to manufacturers in the oil and gas industry that produce drilling pipes and frac balls.


Our automated machines are manufactured in South Korea, and machine installation and aftersales support are provided by local engineers wherever our clients are.

Friction Welding Machines.

Rotary Friction Welding Machines for Electric Components

We provide fully automated friction welding lines with robot arms and poka-yoke capabilities for mass production of e-mobility components, camshafts, pistons, propeller shafts, engine valves, shock absorber rods, torque converters, and rear axle housings. Our machines are equipped with patented hydraulic chucks, steel bar structures, friction welding apparatus, and power steering main shaft mechanics. Automated features allow for easy operation with minimal training.



What sets us apart?

  • Our machine designs are backed by multiple technology patents for welding alloys and mechanical structures that offer superior precision and control when joining dissimilar metals.
  • Stable workpiece grip and consistent shaft centricity throughout the welding process, thanks to our mechanical structure technology present in the friction welding apparatus, hydraulic chucks, and power steering main shaft mechanics.

Machine Models


We provide CNC friction welding machines and hydraulic servo friction welding machines with automated features for easy operation. Our machines are equipped with patented hydraulic chucks, steel bar structures, friction welding apparatus, and power steering main shaft mechanics.


Model 8SFPreferred by camshaft manufacturers in the automotive industry. Features 8-ton forging force for single-sided friction welding.
Model 100SFUsed by track roller manufacturers in the heavy industrial equipment industry.
Model 12DFCNC-controlled machine with high precision and short cycle times, preferred by propeller and drive shaft manufacturers


Machine configurations can be customized to your needs. See our full product range in the Rotary Friction Welding Machine brochure.

Optional features

  • Automated loading and unloading conveyor system
  • Contact-based or non-contact based inspection systems for the feeding conveyor – preferred by clients who arrange NG parts before friction welding

Drivetrain Components

  • Torque converters
  • Camshafts
  • Propeller shafts
  • Intermediate shafts
  • Drive shafts
  • Universal joints
  • Constant velocity joints

Engine Components

  • Turbochargers
  • Engine valves
  • Engine pistons
  • Compressor pistons

Axle and Brake Components

  • Rear axle shafts
  • Brake pistons
  • Yoke shafts
  • Rear axle housings
  • Torque rods

Suspension and Steering Components

  • Shock absorber rods
  • Push rods

Motor Components

  • Motor shafts

Machine Parts and Structural Components

  • Print rollers
  • Ball screws
  • Gear shafts
  • Steel balls
  • Bolts
  • T-shaped bars for gravity-based LNG terminals
  • Drill pipes
  • Valve bodies
  • Flanges
  • Shower heads
  • Aluminum blanks for frac balls

Construction Machine Parts

  • Torque converters
  • Hydraulic piston rods
  • Hydraulic pump pistons
  • Track rollers and roller bushings

Electrical Components

  • Electrical cable connectors
  • Battery cables
  • Bus bars
Rotary-Friction-Welding-Process | friction welding machine
rotary friction welding process | friction welding machine

Hydraulic Friction Welding Machines

Key Benefits

  • Shortened welding cycle time and increased efficiency
  • Easy, user-friendly operation with minimal training required
  • Automated welding system reduces human effort
  • Minimal preparation required on welding materials
  • Low energy consumption
Hydraulic Rotary Friction Welding Machine

Hydraulic Rotary Friction Welding Machines

Welding cycle graphics (Touch screen PC)

Welding cycle graphics (Touch screen PC)

Machine Specs
Nominal Forge Load
Typical Spindle Power
Max Spindle Speed
Range Weldable
(Mild Steel)
Max Weld Area
(Mild Steel)
Hydraulic SF (Single Spindle)
Hydraulic SF (Single Spindle)
DF (Double Spindle)
DF (Double Spindle)
Friction Welding Machine
Spindle Speed
Max. Forging Force
Max. Solid Diameter
Max. Weld Area
Spindle Drive Motor
Friction Welding Machine for camshafts and engine valves
8-Ton Forging Force for Camshafts and Engine Valves
8 SF
1,700 rpm
8 Ton
Ø 28 mm
600 ㎟
Friction Welding Machine for Electrical Connectors
10-Ton Forging Force for Motor Shafts and Cable Connectors
10 SF
2,700 rpm
10 Ton
Ø 32 mm
800 ㎟
10-Ton Forging Force for Intermediary Shafts
10-Ton Forging Force for Intermediary Shafts
10 DF
2,000 rpm
10 Ton
Ø 32 mm
800 ㎟
15-Ton Forging Force for Propeller Shafts
15-Ton Forging Force for Propeller Shafts
15 DF
2,300 rpm
15 Ton
Ø 60 mm
1,100 ㎟
50-Ton Forging Force for Aluminum Blanks for Fracturing Balls
50-Ton Forging Force for Aluminum Blanks for Fracturing Balls
50 SF
1,500 rpm
Ø 100mm
4,000 ㎟
60-Ton Forging Force for Propeller Shafts
60-Ton Forging Force for Propeller Shafts
60 DF
1,500 rpm
60 Ton
Ø 145 mm
5,000 ㎟
Friction Welding Machine with Forging Force of 60 tons for Drill Pipes
60-Ton Forging Force for Drill Pipes
60 DF
1,500 rpm
60 Ton
Ø 145 mm
5,000 ㎟
100-Ton Forging Force for Track Rollers
100-Ton Forging Force for Track Rollers
100 SF
1,000 rpm
100 Ton
Ø 180 mm
7,850 ㎟

CNC Friction Welding Machines

Key Benefits

  • Reduce setup time with automatic servo-driven length adjustments
  • Reduce cycle time with precise servo-controlled speed
  • Increase operational stability by reducing fluctuations in oil temperature


Machine Specs
Nominal Forge Load (ton)
Nominal Forge Pressure (kN)
Stop Angle Accuracy
Mild Steel Weldable Range (mm)
Spindle Rotation (rpm)
Spindle Stroke (mm)
Mild Steel Max Weld Area
CNC Rotary Friction Welding Machines

CNC Friction Welding Machines

Welding cycle graphics (Touch screen PC)

Welding cycle graphics (Touch screen PC)

CNC SF (Single Spindle) | Rotary Friction Welding

CNC SF (Single Spindle)

CNC DF (Double Spindle) | Rotary Friction Welding

CNC DF (Double Spindle)

CNC Friction Welding Machine
Spindle Speed
Max. Forging Force
Max. Solid Diameter
Max. Weld Area
Spindle Drive Motor
For Shock Absorber 8DF
For Shock Absorber
CNC 8DF – 2 Axis Flash Removal
2,000 rpm
8 Ton
Ø 28 mm
500 ㎟
For Drive Shafts 12DF
For Drive Shafts
CNC 12DF – Dual Axis Flash Removal
2,000 rpm
12 Ton
Ø 80 mm
800 ㎟
12-Ton Forging Force for Propeller Shafts
12-Ton Forging Force for Propeller Shafts
1,800 rpm
12 Ton
Ø 80 mm
800 ㎟
CNC Friction Welding Machine with 22 Ton Forging Force for Automotive Engine Parts
22-Ton Forging Force for Automotive Parts
2,000 rpm
22 Ton
Ø 45 mm
1,500 ㎟

Friction Welding Process and Advantages

How does Friction Welding work?

Friction Welding uses friction heat to create a plastic zone between workpieces, which are then forged together with external force. The entire workpiece interface is welded simultaneously, which eliminates offset typically caused by thermally induced stresses. The friction welding process also provides consistent, repeatable quality in which the welded piece has minimal burr or flash because of precise machine-controlled forging force.

Any forgeable material can be friction welded. This includes a wide range of metals, non-metals, and formed products such as castings or powder-metal parts. In cases where forged parts are replaced with sintered or powder metal pressed parts to reduce manufacturing costs, friction welding technology is used to weld partly forged material and powder pressed material together.

Friction Welded Pipe, Bar, and Plate Interfaces

Bar + Bar

bar and bar | rotary friction welding

Bar + Bar

bar and bar | rotary friction welding combination

Optimal shape in the welding zone considering the heat balance

shape of heat balance in rotary friction welding

Pipe + Bar

rotary friction welding pipe to bar

Pipe + Bar

pipe and bar | rotary friction welding

Joining method that best conceals or removes flash

detail showing method of upset concealment | rotary friction welding

Pipe + Pipe

Rotary friction welding pipe to pipe

Pipe + Plate

pipe and plate | rotary friction welding combination

Bar and Plate

bar and plate | rotary friction welding

Advantages of Friction Welding

Can be used to join dissimilar metals

  • Steel + Stainless steel
  • Steel + Powder metal
  • Cu, Al + Stainless steel

Can be used to join non-ferrous metals

  • Al + Cu
  • Al + Al or Cu + Cu

Reduces material costs & forging costs

  • Can replace non-critical parts with less costly materials using friction welding
  • Can replace full forging with partial forging and friction welded components
Friction Welding Reduces Cost

Reduces weight of parts 

  • For example, forged bars can be replaced with tubes
Friction Welding Reduces Component Weight

Streamlines manufacturing processes

  • For example, gundrilling can be replaced with friction welding pipes to bars
Friction Welding over Gun Drilling

Eliminates need for leak inspection

  • Increased air tightness at joints makes them leak-proof
Friction Welding Torque Converter

Rotary Friction Welding Machine Options

Rotary Friction Welding Process Monitoring

Process Monitoring

  • Displays important parameters
  • Data from every weld is stored and easily retrieved


Information Displayed

  • Machine status and diagnostics
  • Welding parameter database
  • Record of each welding cycle
  • Alarm conditions
Flash Removal | Rotary Friction Welding

Flash Removal


  • Applicable to cylindrical shaped workpieces (1-and 2-axis NC)


  • I.D. or O.D. flash can be sheared off directly
  • Applicable to non-cylindrical shaped workpieces
Angle Control | Rotary Friction Welding

Angle Control

  • Mechanically or electronically controlled angles on both ends of the product after welding when specific angles are required, such as with propeller shafts
Auto Stopper | Rotary Friction Welding

Auto Stopper

  • Reduce cycle time via precisely controlled speed using servo motors

Rotary Friction Welding Machine Video

Business Case: Friction Welding for Oil & Gas Ball Drop System Supplier for Fracturing Ball Manufacturing

A Texas-based global oil & gas ball fracturing system manufacturer for oil and gas wells found single headed rotary friction welding machine model 50SF as an answer to its need to weld 2024-T351 aluminum blanks with a wide range of lengths up to a maximum of 5,000 ㎟ welding area. Their aluminum balls that used to be machined from solid blanks are now made by friction welding two aluminum blanks with hollow space inside, and then machined for use as fracturing balls in wells.


This client provides drilling pipe solutions and oil fracturing system for technically challenging applications in open wells in the oil and gas industry. When we worked with this oil fracturing system manufacturer, they were familiar with the advantages of friction welding over other conventional welding methods, as well as the friction welding technology, and wanted to replace their existing manufacturing method with friction welding technology.


Being suggested model 50SF, a hydraulic single headed friction welding head machine, they sent us their aluminum blank samples for test welding which were sent back for quality tests post friction welding. The client conducted their own testing on the welded samples for any mismatch of axis measurements at weld, tensile strengths, and bend tests. After reviewing the test results, they visited our manufacturing site in Korea and signed off to have their own Model 50SF manufactured because it has the capability to handle wider range of blank lengths than competitors and to reduce the loss of aluminum blanks with more precise control.


Rotary friction welding machine model 50SF has a welding precision of 0.5mm length between datum faces, and 0.15mm mismatch of axes at weld. This friction welding machine is equipped with robust 2-axis in-machine flash removal; welding process is shortened this way instead of moving the welding piece to a flash removal station. In addition it is equipped with 2 jaw chuck at the fixed axis and spindle head. Our welding operating system has a touch panel with industrial PC where all the operating information is communicated with the PLC and saved into the PC; it also allows engineers to easily make changes in the welding parameters for customization. Operator can view the real-time display of friction pressure, forged pressure, RPM, and part length value.


All of our rotary friction welding machines are customized to each client’s welding needs. Please contact us for your own friction welding machine specification.

Friction Welding AL Blanks for Fracturing Balls
Aluminum blanks friction welding for fracturing balls | rotary friction welding
Friction Welding Machine Aluminum Fracturing Balls

Business Case: Friction Welding for Automotive Shock Absorber Manufacturer

A global-sized shock absorber rod manufacturer selected our CNC double headed rotary friction welding machine for their steel double welded shock absorber rod production plant when they needed to increase their production size with reduced cycle time and reduced material costs to meet their growing client base and orders.


This client was looking to add a fully automated rotary friction welding line with an automatic loading and unloading function, flash removal feature, and poka-yoke capabilities post welding at its mass production plant in Europe. Their limited floor space at the plant allowed only a well-integrated automatic friction welding line; the line designer had to be equipped with not only the knowledge about the friction welding technology but also a deep understanding of the client’s manufacturing process at the plant, in the automotive industry.


Our friction welding solution for this client was a CNC controlled double sided rotary friction welding machine that welds two end stems to a S45C steel tube at each end simultaneously at maximum 12 tons of forging force.  Maximum weldable area was 800㎟ with tube thickness range of 1-6mm. Shearing unit was attached to the line to allow automatic shearing of the flash post welding, and cycle time was kept at maximum 12 seconds. The welding system was designed to check and monitor the friction force, forge force, total upset amount, main axis RPM, length of the weld, and the friction time for quality control of the welded joint from start to finish. The break for the spindle was designed to stop within 0.5 seconds along with other hydraulic parts to precisely control the weld time, rotation speed, and forge force.


The client’s need for the automatic integrated line provided us with the opportunity to demonstrate our core strength: rich experience and understanding about the automotive industry. From our total clientele base, over 75% are from the automotive industry. Our line design was submitted and approved within a short period of time and the client knew that their friction welding line was being built by a team familiar with automotive manufacturing processes. This client will be equipping the plant with more of these machines to continue supporting their production capacity growth.


We build fully automated friction welding lines for clients’ specific needs.

CNC Friction Welding Machine Shock Absorber
Friction Welding Shock Absorber Rods

Business Case: Single Headed Friction Welding Machine for T-bars

Welding T-bars for LNG Gravity Based Structures


HYD 15SF, a horizontal type single headed hydraulic friction welding machine was designed and manufactured for LNG producer wishing to manufacture T-bars required for structural support of LNG gravity based structures. To create a high strength bond between reinforcement bars (rebars) and end plates to create T-bars that can withstand bending force, and the weight of concrete, our client looked into friction welding to join the two parts.


HYD 15SF was designed to friction weld EN 10025-2 grade G450J0 end plates to S450J0 reinforcement bars with up to maximum weld area of 1000mm² with maximum welding force of 15 ton under total cycle time of 40 seconds with automatic loading and unloading.
Our recent T-bar manufacturer’s requirement was to be able to weld reinforcement bars between diameter of 15mm-32mm to end plates of various sizes (see specification below). The welded T-bars had specific welding quality requirements that included perpendicularity of 3˚, and eccentricity tolerance of 3mm. Welding joint had to maintain its connection at design temperature as low as -60˚C.


Tensile test was required in regular temperature condition, and at low temperature -60˚C. It required the weldments to be tested without flash removal, and fracture had to be observed in the reinforcement bar parent material at minimum 1 bar diameter away from its welded connection. (e.g. 32mm diameter rebar requires fracture to be seen at a minimum 32mm above the welded connection). No partial or total fracture in the T-plate or in the welded connection was allowed.

Bending test required the specimens to be bent without fracture at a 90˚ angle with minor tearing accepted. Hardness of HV5 or 375 was required using a Vickers hardness survey of the weldment’s
longitudinal section.


Material Specification
End plates dimensions: Width 30mm-110mm / Length 60mm to 110mm / Thickness 14mm to 25mm
Reinforcement bars: Diameter 15mm- 32mm.

Friction Welding Machine for T-bars in LNG Gravity Based Structures
Welded T-bars for LNG Gravity Structures

Business Case: Rotary Friction Welding Machine for Torque Converters

Welding Torque Converters for Automotive Powertrain


A CNC controlled friction welding machine CNC 10SFV was developed for our global automotive tier 1 client focusing in powertrain, and thermal systems. CNC 10SFV model friction welds torque converter’s hub and housing vertically.


This vertical rotary friction welding machine maintains cycle time of 36 seconds and a precision level of TIR 0.3mm with fully automated welding process including automatic loading and unloading function and a flash removal unit. This machine friction welds and instantly forges using the generated heat for maximum welding area of 600㎟ and maximum forge force of 10 tons based on the materials and dimension of the torque converters.


Tooling including the jigs are also designed and manufactured in-house to allow one model of friction welding machine for welding different models of torque converters.


Our friction welding machines can be used to friction weld other Powertrain components including:

  • Driveshafts
  • Propeller Shafts
  • Intermediate Shafts
  • Constant Velocity Joints
Friction Welding Torque Converter
Friction Welding Machine_for Torque Converter

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