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【Popular Science】 Why Is Terminal Crimping Regarded as the Lifeline of Wiring Harnesses?
- Categories:Industry News
- Author:Guangdong Deke Electric Co., Ltd.
- Origin:https://www.de-ke.cn/
- Time of issue:2026-07-11 14:23
- Views:
【Popular Science】 Why Is Terminal Crimping Regarded as the Lifeline of Wiring Harnesses?
- Categories:Industry News
- Author:Guangdong Deke Electric Co., Ltd.
- Origin:https://www.de-ke.cn/
- Time of issue:2026-07-11 14:23
- Views:
Within the full manufacturing workflow of wiring harnesses, terminal crimping is often referred to by industry engineers as the "core process" of harness production. Whether for automotive, industrial control or aerospace wiring harnesses, the long-term electrical continuity stability and vibration endurance life of finished products are entirely determined by crimp forming quality.
Specializing in the supply of various precision terminals, Guangdong Dekor Electric fully analyzes the core value of crimping processes from three dimensions — irreplaceable performance advantages, technical process thresholds and hidden quality risks — in compliance with authoritative wiring harness standards including IPC/WHMA-A-620, QC/T 29106 and USCAR-21.
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DEKEELEC—— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— ——
I. Crimping Offers Irreplaceable Integrated Electrical and Mechanical Performance Superior to Soldering and IDC Insulation Displacement
Crimping applies controllable pressure to terminal barrels via dies to induce uniform plastic deformation of copper conductors and terminal metals, forming an airtight cold-welded joint interface that lays the foundation for high-reliability harnesses. It outperforms soldering and IDC termination in multiple key indicators:
(1) Low-resistance long-term conductivity to eliminate overheating risks The airtight bonded structure blocks air oxidation, resulting in minimal contact resistance fluctuation under prolonged thermal cycling. Soldering relies on solder to fill gaps, prone to voids and cold joints at high temperatures. IDC only clamps conductors via single-point blade contact with limited contact area, which easily causes excessive temperature rise under high-current loads.
(2) Tensile and vibration resistance meeting safety-grade equipment standards In line with the automotive pull force standard ISO 19642, qualified crimps steadily meet the minimum pull-out force specified for each wire gauge and resist loosening under sustained jolting and temperature cycling. Solder joints tend to crack under vibrational stress; IDC blades suffer progressive fatigue from repeated vibration, only suitable for indoor static thin-wire signal circuits rather than automotive or industrial power circuits.
(3) All cold working process to avoid wire insulation damage Crimping generates no heat-affected zones and will not scorch wire insulation. High temperatures during soldering shrink and embrittle insulation, creating hidden leakage hazards.
Thanks to the above distinctive advantages, standardized crimping is specified as the only compliant wire termination method in industries with strict safety and durability requirements such as automotive, aerospace and energy storage. Crimp quality directly governs the reliability of signal and power transmission for vehicles and complete equipment.
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II. Crimping: The Core Technical High Ground of Harness Manufacturing with Dozens of Controlled Parameter Dimensions
Many practitioners mistakenly regard crimping as merely "pressing terminals and wires together". In fact, it is a complete, quantified precision process system with full quality benchmarks stipulated in IPC and national automotive harness standards. Control dimensions cover equipment, dies, pre-process pretreatment and forming parameters:
(1) Hardware precision sets the baseline performance ceiling Machining tolerances of fully automatic crimping machines, ratchet crimpers and matching dies directly affect crimp height and indent symmetry. Die wear or equipment pressure deviation leads to mass production of hidden defective products.
(2) Interlocked parameters in upstream processes Wire stripping length, broken strand ratio, stranded wire neatness and terminal model matching all manifest in the final crimp cross-section. Deviation of any single parameter will damage the airtight metal bonding effect.
(3) Quantified inspection criteria after forming Mandatory industrial inspection items include crimp height, metallographic cross-section, bellmouth dimension, pull-out force and conductor exposure length, each with a clear standard range without ambiguous judgment.
Even if upstream wire cutting and stripping processes achieve 100% conformance, out-of-control crimp parameters render all prior processing invalid. As an irreversible process, crimping cannot be reworked after forming; defective products must be scrapped entirely, making crimping the core control point for production cost and yield.
DEKEELEC—— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— ——
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III. Hidden Defects & Irreversible Process: Crimping as the Core Linchpin of Harness Quality Control
The biggest challenge in crimping process control lies in the highly concealed nature of defects. Visual surface inspection alone cannot detect hidden internal issues such as fractured copper strands, bonding voids and insufficient crimp stress. Many products pass continuity tests before delivery yet develop intermittent open circuits after vibration and damp-heat aging, all stemming from internal crimp defects. Two universal destructive verification tests are adopted across the industry to validate crimp compliance:
- Crimp cross-section metallographic micrograph testing: Slice open the crimp zone to observe uniform compression of copper strands, strand breakage, and formation of complete airtight bonding interfaces.
- Destructive pull-out force test: Conduct tensile testing at a constant speed of 25.4 mm/min. A qualified crimp shall sustain the standard tensile load for 60 seconds without slippage or detachment, complying with UL486E and QC/T 29106 test specifications.
The service life and fundamental operational safety of a complete harness are fully underpinned by crimp quality. It is hailed as the "soul" of harness manufacturing because it delivers three core functions: electrical performance, mechanical strength and long-term durability, making it an indispensable critical control node for harness quality.
DEKEELEC—— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— —— ——
All automotive, industrial control and new energy terminal series from Guangdong Dekor Electric are compatible with standardized crimping process parameters. We can provide customers with corresponding reference standards for crimp height and pull-out force as well as cross-section evaluation specifications. Technical support including terminal selection and crimping process debugging is also available to help harness manufacturers stabilize finished product yield and fundamentally reduce after-sales failures such as poor contact, overheating and vibration-induced open circuits.
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