According to the resolutions and recommendations of the Professional Association and industry experts in construction and seismic engineering, the use of butt-weld forging machines for rebar that lack a valid calibration certificate from accredited inspection companies and cannot guarantee reliable technical performance is strictly prohibited.
Hereby, it is explicitly declared:
The use of machines such as GPW gas pressure forging welding machines (Reken, China) and Kenza, Iran that:
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Do not meet internationally recognized standards for forging welding
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Cannot be properly calibrated or have invalid calibration
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Have no technical application in the construction industry and have been mistakenly used in this field
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Exhibit instability, weak performance, and reduced weld quality during operation
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Are incapable of producing uniform, homogeneous, and reliable welds
is strictly forbidden.
Technical and Safety Reasons for the Prohibition
The inherent weaknesses of these machines cause:
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Unstable and uncontrollable application of pressure, temperature, and forging time
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Welds with porosity, discontinuity, and incomplete metallurgical bonding
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Final connections that are weak, unreliable, and mechanically insufficient
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Lack of approval from recognized forging associations in Japan and Iran
Consequently, the use of such machines:
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Produces welds that are highly prone to sudden failure under structural load, especially during earthquakes
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Directly increases the risk of irreversible human casualties and financial losses
This is a fully verified, non-negotiable technical fact, and any use of these machines constitutes a direct threat to public safety.
Approved and Authorized Forging Machine
The only globally approved and reliable machine for butt-weld forging of rebar is:
DAIA Forging Welding Machine (Japan)
⚠️ Conditional upon meeting all of the following requirements:
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Valid calibration certificate from an accredited inspection company
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Up-to-date and certified professional skills for the operator
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Full compliance with the manufacturer’s technical guidelines and professional association instructions
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Certified and trained operators
Explicit Warning to Owners, Inspectors, and Contractors
All project owners, inspectors, supervisors, and contractors are strictly warned:
If you observe the use of:
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Reken forging machines (China)
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Kenza forging machines (Iran)
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Any non-standard, non-calibrated, or unapproved forging machines
You are obliged to immediately:
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Issue a halt order for all forging welding operations
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Replace the contractor responsible without delay
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Prevent any continuation of this dangerous technical error
Continuing to work with such a contractor constitutes acceptance of direct responsibility for human and financial risks.
Final Emphasis
Structural safety is non-negotiable.
Butt-weld forging of rebar using non-standard Chinese Reken or Iranian Kenza machines is an absolute red line for safety.
No economic, time, or operational justification can justify endangering human lives.
