Technical Evaluation of Rebar Butt-Forging Equipment in Reinforced Concrete Construction

In modern building construction, particularly in earthquake-resistant reinforced concrete structures, the quality of rebar connections plays a decisive role in overall structural performance. Butt-forging welding machines are among the most critical and technically sensitive construction equipment, and their reliability depends entirely on design integrity, manufacturing quality, operational stability, and compatibility with various rebar types.

Performance of DAIA Japan Forging Machines

Based on decades of international and domestic construction experience, DAIA Japan forging machines are recognized as one of the most reliable and efficient systems. They have been applied and field-tested in hundreds of construction and infrastructure projects under diverse working conditions.

Key technical advantages of DAIYA machines:

Full compatibility with a wide range of rebars regarding material, quality, and diameter
Excellent performance in horizontal and vertical welding positions
Production of homogeneous, defect-free, and mechanically stable welds

These features have positioned DAIYA as a trusted reference among civil engineers, welding engineers, and technical inspectors worldwide.

Technical Limitations of Riken China Machines

Riken China forging machines exhibit lower component quality, operational stability, and durability compared to international reference brands. Key issues include:

High wear rate and frequent maintenance
Acceptable performance only for smaller rebar diameters (14, 16, 18, and up to 20 mm)
Inability to provide consistent and high-quality welds for larger sizes

Consequently, civil engineers and welding specialists do not recommend Riken machines for critical or high-responsibility projects.

Status of Copied Kenza iran Machines

Copied and incomplete machines marketed as Kenza have been found in various projects. Due to severe pressure and heat fluctuations during welding, inability to weld even 16–18 mm rebars, and premature weld failures, these machines are prohibited in many cities and projects. Welds produced are not approved by technical inspectors or professional associations, and continued use poses significant financial and safety risks.

Professional Recommendation for Purchasing Forging Machines

Based on field experience:

Selecting DAIYA Japan is essential

All welds will be high-quality, uniform, and reliable
No project will reject you for using inferior Chinese or Est-Kenza machines
Your professional credibility is preserved, and welds will not fail
Embarrassment, reputational damage, and technical problems are prevented

A responsible and professional contractor should choose DAIYA Japan forging machines only for critical and high-responsibility projects to minimize technical and financial risks.

Technical Conclusion

In the sensitive process of rebar butt forging, equipment quality directly determines weld integrity and structural safety. Global experience and field evidence indicate that DAIYA Japan machines provide a reliable benchmark for defect-free and structurally sound welds, while the use of low-quality, copied, or unstable machines introduces serious risks to investments, structures, and human life.

Comparison Criteria	DAIA Japan	Riken China	Kenza iran
Weld Quality	👌 Very high, uniform, defect-free	⚠️ Moderate for small diameters	❌ Very low, unreliable welds
Compatibility with Rebars	✔️ All diameters and materials	✔️ Limited up to Ø20mm	❌ Even Ø16–18mm problematic
Operational Stability (Pressure/Heat)	✔️ Very stable throughout process	⚠️ Moderate fluctuations	❌ Severe fluctuations, poorly controlled
Equipment Durability	👌 Very high, long lifespan	⚠️ Lower, components wear faster	❌ Very low, frequent breakdowns
Maintenance & Repair Costs	💰 Low (high-quality components)	💸 Medium to high (weak parts)	💸💸 Very high (repeated failures)
Project Acceptance	✔️ Widely accepted and trusted	⚠️ Occasionally accepted in small projects	❌ Prohibited in many projects/cities
Inspector/Association Approval	✔️ Fully approved	⚠️ Limited approval in some cases	❌ Rejected
Risk of Weld Failure under Load	🔻 Very low	🔻 Medium	🔺 High
Impact on Contractor Reputation	✔️ Enhances credibility	⚠️ Possible credibility risk	❌ Threatens reputation and professionalism
Recommendation by Civil & Welding Experts	✔️ Strongly recommended	⚠️ Limited recommendation	❌ Not recommended at all

🔍 Quick Summary

✅ DAIA Japan:

Best weld quality
High stability and durability
Compatible with all rebar sizes
Low maintenance costs
Highest customer satisfaction
Professional choice for critical projects

⚠️ Riken China:

Acceptable only for smaller rebars
Moderate operational stability and maintenance cost
Not recommended for projects

❌ Kenza iran:

Weak and unreliable welds
Severe operational fluctuations and weld failures
High maintenance and repair costs
Disapproved by inspectors, banned in many projects