Riveting, welding, and interlocking all hold electrical-steel laminations together, but they suit different priorities. Riveting provides a mechanical joint that can be specified independently of the lamination profile; welding creates a permanent fused joint but introduces localized heat; interlocking uses features formed in the laminations to join them without separate fasteners. The right choice depends on the motor’s magnetic and mechanical requirements, production volume, geometry, and inspection plan—not on a single method being best for every core.
For an initial decision, consider interlocking when the lamination design and production process can accommodate formed joints; consider riveting when a mechanical fastening approach is preferred; and evaluate welding when a permanent joint is needed and its thermal and magnetic effects can be assessed. Before selecting a process, confirm the required stack integrity, dimensional tolerances, operating conditions, and applicable validation tests. The comparison below is intended to help buyers frame those decisions and prepare a useful supplier inquiry.
These descriptions are general. A method’s actual suitability depends on core geometry, steel grade and coating, stack dimensions, manufacturing equipment, and the motor’s performance requirements.
This comparison focuses on how the three methods hold a laminated motor core together and on the practical questions buyers should resolve before production. It does not assume that one joining method will deliver a particular efficiency, noise level, production rate, or cost advantage in every application. Those outcomes depend on the design and should be verified against the project’s requirements.
Joining is only one part of core performance. Lamination material, sheet thickness, burr condition, insulation coating, stacking accuracy, and handling can also influence electrical and mechanical behavior. A sound sourcing decision therefore compares the complete core and its manufacturing controls, not just the name of the joining process.
In a riveted stack, fasteners pass through prepared locations and mechanically retain the laminations. The design must account for rivet position, hole or feature geometry, access for assembly, and the resulting effect on the available core area. Depending on the arrangement, rivets may be placed at selected points rather than continuously around the stack.
Because riveting does not fuse the sheets, it avoids the localized welding heat associated with a welded joint. However, holes and fasteners take up space and may interrupt the lamination pattern. Buyers should ask how the supplier controls rivet installation and verifies stack dimensions and retention for the intended operating conditions.
Welding joins the stack by fusing material at selected points or along defined seams. The joint can be permanent and does not require separate rivets, but heat is introduced into the core. Depending on material, weld placement, and process settings, this can affect the nearby coating or material condition, so the design should consider both the joint and the area around it.
Weld location and extent are important design inputs. Buyers should identify permitted weld zones, acceptable appearance criteria, and any performance checks required after joining. A supplier should be able to discuss the proposed weld approach in relation to the drawing and explain how the process will be controlled, rather than relying on a generic claim that welding is suitable.
Interlocking uses features formed into the laminations to engage neighboring sheets as the stack is built. This can eliminate separate joining components and may be integrated into a progressive stamping process. The geometry and location of the interlocks must be compatible with the lamination layout and the required stack behavior.
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Interlocks are not a universal substitute for every other joining method. Their performance depends on feature design, forming consistency, material condition, and the number and placement of engagement points. Buyers should confirm how the supplier will inspect the features and whether the design can maintain the required stack dimensions and integrity.
| Decision factor | Riveting | Welding | Interlocking |
|---|---|---|---|
| Joining principle | Separate mechanical fasteners retain the stack | Localized fusion joins the sheets | Formed features engage between sheets |
| Design dependency | Fastener positions and access must be designed in | Weld paths or points and heat effects must be considered | Lamination features and forming capability must be designed in |
| Separate joining parts | Yes | No separate rivets, though welding equipment is required | Generally no separate fasteners |
| Key buyer review | Fastener arrangement and retention checks | Weld placement, process control, and heat-related evaluation | Interlock geometry, feature consistency, and stack inspection |
| Typical sourcing question | Can the fasteners and holes fit the core design? | Can the weld be placed without unacceptable effects? | Can the stamping design form repeatable, suitable joints? |
The table is a screening tool, not a substitute for engineering review. Production cost and lead time depend on tooling, process routing, order quantity, inspection requirements, and the supplier’s existing capabilities. Request a quotation based on the same drawing revision and quality requirements when comparing methods.
Riveting may be worth evaluating when a mechanical fastening approach fits the design and the core can accommodate the required fastener locations. It can also be considered when the buyer wants the joining hardware and its installation to be explicit items in the process specification. Check for potential conflicts with winding space, magnetic paths, assembly access, and the required stack profile.
Welding may suit designs that need a permanent joined stack and have defined, accessible locations for welds. It is important to agree on the weld pattern and inspection criteria before production, particularly when material coating or magnetic performance is sensitive to local process effects. Where those effects are uncertain, discuss prototype or sample evaluation and define the acceptance criteria in advance.
Interlocking is a candidate when the lamination profile can incorporate suitable features and the production route can form them consistently. It may be attractive when reducing separate fasteners is a project priority, but that benefit should be weighed against tooling and design constraints. Confirm that the interlock design does not compromise critical geometry or the buyer’s required core performance.
There is no reliable universal cost ranking among the three methods. Riveting uses fasteners and an installation operation; welding requires a controlled welding process; and interlocking may require appropriate stamping features and tooling. For all three, volumes, changeover needs, inspection, material availability, and tooling ownership can influence the commercial offer.
To make quotations comparable, provide the same core drawing, material and coating requirements, annual or order quantity, target tolerances, and inspection expectations to each supplier. State whether the joining process is fixed or open for recommendation. Ask for tooling charges, minimum order quantities, sample or validation requirements, estimated lead time, and how design changes would affect those terms.
For illustration only, a buyer might identify a lamination thickness of 0.35 mm, a nominal stack height of 50 mm, and a stack-height tolerance such as ±0.10 mm in an engineering discussion. These example values are not universal specifications or recommendations; project engineers must set values for the motor design. Also define the datum, measurement method, and inspection stage so the supplier and buyer interpret the requirements consistently.
Riveting, welding, and interlocking each offer a different way to retain a motor core stack, and the best fit depends on design constraints and validated requirements. Start with the core’s magnetic, mechanical, dimensional, and production needs; then compare the joining methods against those priorities. If a method could affect coating condition or core performance, define how that concern will be evaluated rather than assuming the effect is negligible.
Onlink supports B2B buyers evaluating electric motor core parts and manufacturing options. Share your drawing, material requirements, target quantity, and key acceptance criteria so the team can review the application and discuss a suitable stacking approach. A clear technical brief helps establish comparable quotations, realistic lead-time expectations, and the right next step for sample or production planning.
For more information, please visit Motor Core Stacking Methods Compared: Riveting, Welding and Interlocking.