How to Do Motor Stator Welding?

Have you ever wondered what goes into the process of motor stator welding? If you’re involved in the manufacturing of electric motors or have a keen interest in understanding the intricacies of this essential component, you’re in the right place.

At Motorneo, a trusted motor lamination manufacturer in China, we specialize in providing a range of services, including welding, assembly processes, etc.

In this comprehensive guide, we will depth introduce motor stator welding, shedding light on the crucial steps, and techniques, that contribute to the assembly of electric motors.

What is electric motor stator Welding?

Developing a robust and stable stator welding process is critical since the many connections between stator coils and the “outside world”. It involves the process of joining two or more metal sheets to create a single lamination that forms part of an electric motor. The stator is the stationary part of an electric motor and is primarily to keep the electrical field aligned.

The primary purpose of the welding system is to create a strong and reliable bond between the laminations, ensuring that they remain securely in place and maintain proper alignment during the motor’s operation. As the use of electric motors in automobile power trains has increased, stator welding has become an established manufacturing process

laser welding

Types of Motor welding

Our automatic stamping machine punching motor stator and rotor lamination stacks. Once the motor stator and rotor lamination stamping finish, we use riveting, cleating, gluing, self-bonding, and welding to stack our laminations. We commonly use welding including:

Laser Welding

We provide a high-precision laser welding technique that utilizes a focused laser beam to melt and join the edges of the stator laminations. This method offers high-quality control, making it ideal for intricate stator designs and thin laminations.

In industries with high production volumes, laser welding is one of the most frequently used technologies for hairclip welding of thick wires.

TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) Welding

TIG +MIG welding compared with laser welding, is an arc welding process that uses an electric arc to generate the heat necessary for welding. These methods are versatile and widely used in stator welding for various motor sizes and materials.

TIG Welding: TIG welding involves using a non-consumable tungsten electrode to create an arc. It offers precise control over the welding process and is suitable for thin laminations.

MIG Welding: MIG welding employs a consumable wire electrode that feeds continuously. It’s known for its speed and is commonly suitable for thicker laminations. MIG welding provides excellent weld penetration and is suitable for larger motor components.

TIG welding motor stator

Resistance Welding

Resistance welding is another widely used method in motor stator production. It involves passing an electrical current through the stator laminations, causing them to heat and fuse together.

For high-volume production, techniques like resistance welding or projection welding may be more efficient than manual welding techniques.

Spot Welding

Spot welding is a variation of resistance welding, where small, localized welds (spots) are made at specific points on the stator laminations. It’s suitable for smaller motors or when a limited number of welds are required.

Process of stator stacks with laser welding

Material Preparation

Begin by preparing the laminated steel sheets that will make up the stator stack. These sheets have coat-insulating material to prevent electrical short circuits.

Ensure that the laminations are clean and free from contaminants like oil, rust, or debris, as cleanliness is critical for a successful weld.

Alignment and Fixturing

Accurately align and fixture the laminations. Proper alignment ensures that the stack’s dimensions meet the motor’s specifications.

Fixturing is essential to hold the laminations securely in place during the welding process, preventing misalignment or movement.

Laser Setup

Set up the laser welding machine according to the specific parameters required for the stator stack welding. This includes adjusting laser power, pulse duration, and beam focus.

Laser welding machines may also include vision systems to precisely position the laser beam relative to the laminations.

Laser Welding

Activate the laser and direct the focused laser beam onto the edges of the welding laminations.

As the laser beam makes contact, it rapidly heats the edges of the laminations, causing them to melt and fuse together.

The welding process typically involves moving the laser beam along the edges of the laminations to create a continuous weld. The speed and movement need to be controlled to ensure consistent and defect-free welds.

Quality Control and Inspection

Immediately after welding, conduct a visual inspection to identify any weld defects, such as incomplete fusion or cracks.

Non-destructive testing methods, like ultrasonic testing or dye penetrant testing, may also ensure the quality of the welds.

Any defects or irregularities found during the inspection are addressed promptly.

automatic laser welding machine

Post-Welding Treatment

Depending on the application and material, post-welding treatments such as stress relieving or annealing may be required to relieve residual stresses and improve the overall properties of the weld.

Looking for Reliable Motor Laminations and Expert Welding Services?

At Motorneo, with a wealth of experience, we provide a wide range of motor iron core laminated solutions tailored to your specific needs. Whether you need DC motors, high voltage motors, switched reluctance motors, servo motors, linear motors, or any other motors, our custom-designed laminations and precision welding services are engineered to meet the highest standards.

Our dedicated team of experts understands the importance of precision in motor manufacturing. That’s why we offer cutting-edge laser welding and other welding services to ensure the durability, performance, and efficiency of your electric motors.

Ready to take your motor manufacturing to the next level? Contact us today to discuss your requirements, explore custom design possibilities, and benefit from our world-class welding services.

visit the industry electric motor core factory


In conclusion, mastering motor stator welding is essential for ensuring the reliability and performance of electric motors. By understanding the basics, following proper procedures, and implementing best practices, you can achieve consistent, high-quality stator welds.

For more information on specialized stator welding methods, such as laser welding or TIG and MIG welding, or to learn about motor lamination stacking, visit our relevant service and post pages.


What are the primary materials for motor stator construction?

Laminated Steel Sheets: Laminated steel sheets are the foundational material for constructing motor stators. These sheets use silicon steel (also known as electrical steel or transformer steel) and coat-insulating material to prevent electrical short circuits. The laminations stacking and bonding together to form the stator core.

Copper or Aluminum Wire: Copper or aluminum wire winds the coils within the stator core. These coils are responsible for generating the electromagnetic field when an electric current flows through them. Copper has superior electrical conductivity, but aluminum applies in some applications due to its lighter weight and cost-effectiveness.

Insulating Materials: Various insulating materials are used to separate and insulate the individual laminations in the stator core to prevent eddy current losses. These materials may include paper, varnish, epoxy, or other non-conductive coatings.

How can I troubleshoot welding defects in motor stators?

Visual Inspection: Begin with a thorough visual inspection of the welded stator. Look for visible defects such as cracks, incomplete fusion, excessive spatter, or irregular weld bead profiles. Pay attention to areas where the laminations meet, as defects are often found at the edges of the weld.

Dimensional Checks: Measure the stator dimensions to ensure they meet the motor’s specifications. Welding defects can sometimes cause warping or distortion, which may affect the stator’s size and alignment.

Non-Destructive Testing (NDT): Consider employing non-destructive testing methods, such as ultrasonic testing, dye penetrant testing, or radiographic testing, to detect internal defects that may not be visible through visual inspection alone. NDT methods can reveal subsurface cracks, porosity, or incomplete fusion.

Weld Parameters Analysis: Review and analyze the welding parameters used during the welding process. Check factors like current, voltage, travel speed, and wire feed rate. Deviations from the recommended parameters or welding standards can lead to defects.

Material Analysis: Evaluate the quality and condition of the materials used in the stator stack. Ensure that the laminated steel sheets are free from contaminants and that the insulating coatings are intact. Verify that the welding electrodes or wire are of the correct type and quality for the specific application.

Welding Technique Assessment: Assess the welding technique employed, including the welding position, sequence, and operator skill. Inconsistent or improper technique can lead to defects, especially in complex or high-precision welds.

Machine and Equipment Inspection: Examine the welding equipment, including the welding machine and fixtures. Ensure that the equipment is properly calibrated and maintained. Malfunctions or misalignments in the equipment can contribute to welding defects.

Do China manufacturers offer custom motor lamination services?

Yes, we offer custom motor lamination services. Our companies in China specialize in producing motor laminations tailored to the specific needs of their clients. With have years of expertise, equipment, and capabilities to provide customized solutions for various types of electric motors(such as industrial motors, electric vehicle motors, elevator traction motors, and more ).

what is the motor Hairpin welding process?

Motor hairpin welding is a specialized welding process used in the manufacturing of electric motors, particularly for the assembly of the motor’s stator. This process is named after the hairpin-like shape of the copper or aluminum wires used in the stator winding.

Try to contact us for high-quality motor cores in China.