GB/T 40800-2021 in English
VALIDSpecification and qualification of welding procedures for production welding of steel castings
- Issued on:2021-10-11
- Implemented on:2022-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
| Standard No: | GB/T 40800-2021 |
| Document status: | VALID |
| Title in English: | Specification and qualification of welding procedures for production welding of steel castings |
| Title in Chinese: | 铸钢件焊接工艺评定规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2021-10-11 |
| Implemented on: | 2022-05-01 |
| ICS Classification: | 77.140.80-Iron and steel castings |
| Chinese Classification: | J31-Casting |
| Professional Classification: | GB-National Standard |
| Related Keywords: | process qualification process prepare
welding procedures production welding steel castings introduction interpretation applicationarc welding |
| Related Topics: | cast steel
Welding procedure qualification welding process Steel castings GBT40800 GB/T 40800-2021 welding process nb/t47021-2012 Welding process qualification Laser welding welding process evaluation Rail welding standards and processes |
《GB/T 40800-2021铸钢件焊接工艺评定规范》由TC54（全国铸造标准化技术委员会）归口，TC54SC1（全国铸造标准化技术委员会铸钢分会）执行，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
This standard is modified to adopt ISO11970:2016 and is applicable to arc welding process assessment. The main technical changes include:
| Dimensions | GB/T40800-2021 | ISO11970:2016 |
|---|---|---|
| Scope of application | Arc welding is clearly defined | Welding method is not clearly defined |
| Number of specimens | 2 specimens for transverse tensile | Number is not clearly specified |
| Test items | Add hardness test requirement | Hardness test is not mandatory |
Key technical requirements
1. Process qualification process
- Prepare preliminary procedure (pWPS)
- Welding test pieces (including butt joints and repair welded joints)
- Test according to Table 1:
- 100% non-destructive testing
- 2 transverse tensile specimens
- 4 bend specimens
- Formulate WPQR report
2. Material grouping system
Cast steel is divided into 8 groups (AH groups) according to mechanical properties, among which:
Example: The assessment of group A3 (Rel>360MPa) can cover groups A1-A2, but welding of dissimilar steels requires separate assessment.
Implementation suggestions
Key points of process control
| Heat input control | Formula: Q=k×UI/1000v |
| Preheating temperature | Allowed to decrease by ≤50℃ |
| Post-weld heat treatment | Cumulative time ≥80% of product heat treatment time |
Note: For specimens with a thickness of ≥50mm, the number of impact test specimens needs to be increased.
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