GB28736-2019
Minimum allowable values of energy efficiency and energy efficiency grades for welding machines
电焊机能效限定值及能效等级
GB 28736-2019 is a current mandatory Chinese national standard for Minimum allowable values of energy efficiency and energy efficiency grades for welding machines. It appears in the Construction compliance cluster with a energy efficiency focus and has an implementation date of Jul 1, 2020.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to arc welding machines and resistance welding machines designed for industrial and professional uses, supplied at voltages not exceeding those specified in GB/T 156. It specifically covers resistance welding transformers with final installations of frames, input, and secondary circuits. This standard is mandatory for applicable welding equipment entering the Chinese market, excluding AC TIG welders, seam welders, and separately sold transformers.
Technical requirements
GB 28736-2019 establishes a 3-tier energy efficiency grading system for welding machines, where Grade 1 represents the highest efficiency. The standard sets the minimum allowable values of energy efficiency at Grade 3, which acts as the mandatory threshold for market access. For arc welding machines, the standard specifies requirements for efficiency, power factor under load conditions, and the percentage of no-load current relative to rated input current. These parameters are categorized by welding types such as MIG/MAG and DC TIG across various rated current ranges. For resistance welding machines, the technical requirements focus on maximum limits for short circuit loss and no-load loss, as well as no-load current. Manufacturers must ensure their products meet at least Grade 3 requirements to be compliant, with specific metrics varying by nominal power at 50% duty cycle.
Testing methods
Testing must be conducted on new, dry, and completely assembled machines at an ambient temperature of 10°C to 40°C under thermal equilibrium. For arc welding machines, tests are performed at the rated maximum welding current, while resistance welding machines are tested at the rated capacity step corresponding to a 50% duty cycle. Accurate measurement requires power supplies with specific impedance and waveform characteristics, utilizing measurement devices with an accuracy of 0.5 class.
FAQs
What products are regulated under GB 28736-2019?
It regulates arc welding machines and resistance welding machines for industrial and professional use, including MIG/MAG and plasma arc cutting machines. It excludes AC TIG welders and separately sold resistance welding transformers.
What is the minimum energy efficiency requirement under this standard?
The standard defines three energy efficiency grades. Grade 3 serves as the mandatory minimum allowable value of energy efficiency that all applicable products must meet to be sold in China.
Are there any updates from the previous version of GB 28736-2019?
Compared to GB 28736-2012, this version adds terms and definitions for the energy efficiency limits of resistance welding machines, introduces energy efficiency grades for them, and includes corresponding test methods.
The summary above provides a high-level overview of GB 28736-2019. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 28736-2019 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Management
- CCS
- F01
- ICS
- 27.010
- Competent department
- Standardization Administration of China
- Technical committee
- National Technical Committee on Energy Fundamentals and Management of Standardization Administration of China
Relationships
Replaces:GB 28736-2012