QJ-211S Universal Tensile Testing Machine for Welded Metal Joints
| Brand | Qinsun |
|---|---|
| Origin | Shanghai, China |
| Model | QJ-211S |
| Type | Electromechanical Universal Testing Machine |
| Max Test Load | 30 kN |
| Load Accuracy | ±0.5% of reading |
| Crosshead Travel | 500 mm |
| Effective Test Width | 420 mm |
| Vertical Test Space (without fixtures) | 800 mm |
| Speed Range | 0.001–500 mm/min |
| Speed Accuracy | ±0.5% of set value |
| Displacement Accuracy | ±0.5% of reading |
| Deformation Measurement Accuracy | ±0.5% of reading |
| Load Resolution | 300,000 counts full scale, single-range, constant resolution |
| Safety Features | Electronic limit protection, overload protection (10% above capacity), manual/auto return, jog-controlled crosshead lift |
| Motor Power | 750 W |
| Dimensions (W×D×H) | 700 × 420 × 1600 mm |
| Weight | 145 kg |
| Compliance | Meets ISO 7500-1 Class 0.5, ASTM E4, ASTM E8/E21, GB/T 228.1–2021 |
Overview
The QJ-211S Universal Tensile Testing Machine is an electromechanical static testing system engineered for precise mechanical characterization of welded metallic joints and related structural components. Designed in accordance with international metrological standards—including ISO 7500-1 (Class 0.5 accuracy), ASTM E4 (load verification), and ASTM E8/E21 (tensile testing of metals)—this machine applies controlled uniaxial force to specimens while continuously measuring load, displacement, and optional strain via extensometry. Its closed-loop servo control architecture ensures high reproducibility across repeated tests, making it suitable for quality assurance in welding process validation, weld qualification per AWS D1.1 or ISO 15614, and failure mode analysis in R&D environments. The system operates under Windows-based control software, enabling real-time graphical visualization of stress–strain curves, modulus calculation, yield point detection, ultimate tensile strength (UTS), elongation at break, and reduction of area—all traceable and exportable in compliant formats.
Key Features
- High-fidelity load measurement with ±0.5% accuracy over the full 30 kN range, validated per ISO 7500-1 Class 0.5 requirements
- Constant-resolution force transduction (300,000 internal counts) without range switching—eliminates step discontinuities during low- to high-load transitions
- Adjustable crosshead speed from 0.001 to 500 mm/min, with speed stability maintained within ±0.5% of setpoint
- Dual-mode crosshead positioning: precision jog control for fixture alignment and programmable auto-return for high-throughput workflows
- Integrated safety architecture including electronic travel limits, 110% overload cut-off, and emergency stop circuitry compliant with IEC 60204-1
- Rigid C-frame construction (700 × 420 × 1600 mm, 145 kg) minimizes frame deflection and enhances test repeatability under dynamic loading conditions
Sample Compatibility & Compliance
The QJ-211S accommodates a broad spectrum of welded joint geometries—including butt, lap, fillet, and T-joints—using interchangeable pneumatic, wedge-grip, or custom-designed fixtures (available on request). Specimen thickness up to 25 mm and width up to 40 mm are supported within the 420 mm effective test width. The 800 mm vertical test space allows evaluation of full-scale weld coupons per ISO 4136 or ASTM E8M. All test protocols adhere to GLP-relevant data integrity principles: audit trails, user-level access controls, and timestamped raw data logging ensure compliance with FDA 21 CFR Part 11 when paired with validated software configuration. Calibration certificates traceable to NIM (National Institute of Metrology, China) or equivalent national metrology institutes are provided upon installation.
Software & Data Management
The embedded Windows application supports multi-curve overlay, derivative-based yield identification, automatic parameter extraction (e.g., Rp0.2, E-modulus, A50mm), and customizable report templates in PDF/Excel. Raw ASCII data files (.txt) retain full temporal resolution for post-hoc reanalysis. Software features include curve smoothing filters (Savitzky–Golay), linear/nonlinear regression tools, and batch processing for statistical comparison across weld batches. Data export complies with ASTM E1434 and ISO 10360-5 requirements for measurement uncertainty documentation. Optional IQ/OQ/PQ documentation packages support GMP-regulated manufacturing facilities.
Applications
- Quantitative assessment of weld tensile strength, ductility, and fracture behavior per ISO 15614-1 and AWS B4.0
- Comparative evaluation of filler metal performance across heat input variations
- Validation of post-weld heat treatment (PWHT) effectiveness on residual stress mitigation
- Mechanical screening of dissimilar metal welds (e.g., stainless steel to carbon steel)
- Research-grade characterization of laser-MIG hybrid weld microstructures
- Quality control in aerospace component fabrication (per AMS 2644 and EN 4678)
FAQ
Does the QJ-211S support extensometer integration for true strain measurement?
Yes—standard analog or digital extensometers (LVDT or clip-on types) can be connected via dedicated signal conditioning modules; strain accuracy remains ±0.5% of reading when calibrated per ISO 9513.
Can test methods be pre-programmed and recalled for routine QC checks?
Absolutely—the software allows saving fully parameterized test methods (speed profiles, trigger conditions, output variables) with version-controlled naming and user-defined metadata fields.
Is third-party calibration and certification available for regulatory audits?
Yes—Qinsun partners with ISO/IEC 17025-accredited calibration laboratories; certificates include measurement uncertainty budgets aligned with ISO/IEC 17025:2017 Annex A.
What maintenance intervals are recommended for sustained accuracy?
Biannual verification of load cell linearity and crosshead alignment is advised; annual full recalibration is recommended for GLP/GMP environments.
Are firmware updates and software patches provided post-purchase?
Yes—registered users receive free lifetime firmware and software updates, including compatibility patches for new Windows OS versions and security enhancements.
