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GB/T 40320-2021Measuring method for mechanical melting temperature of aluminum alloy (English PDF)

铝合金力学熔点测试方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 40320-2021 is the English-translated version of 铝合金力学熔点测试方法.

GB/T 40320-2021 gives a test method for the mechanical melting temperature of aluminium alloys, the interval between the peak temperature at which residual stress is highest and the temperature at which it falls to its trough.

A testing machine simulates the thermal cycle of hot working at different peak temperatures, the residual stress is measured for each, and the mechanical melting temperature is calculated from the curve of residual stress against peak temperature.

The testing machine is calibrated to GB/T 16825.1-2008 at class 1 or 0.5, and the references include thermocouple wire to GB/T 2614 and tensile specimens to GB/T 16865.

It applies to aluminium alloy plates and profiles, to optimise the parameters of welding, heat treatment, casting, forging and other hot working. It was issued on 20 August 2021 and has applied since 1 March 2022.

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Document preview — GB/T 40320-2021

National Standard of the People's Republic of China

ICS: 77.040.10
Classification: H 21

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of the method
5 Apparatus and equipment

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document specifies the test method for the mechanical melting point of aluminum alloys.

This document is applicable to the mechanical melting point test and its parameters of the welding, heat treatment, casting, forging and other hot working processes of aluminum alloy plates or profiles. Number optimization.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2614 nickel-chromium-nickel-silicon thermocouple wire

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 16825.1-2008 Inspection of static uniaxial testing machine Part 1: Inspection and test of tensile force and (or) press force measuring system calibration

GB/T 16865 Specimen and methods for tensile test of deformed aluminum, magnesium and its alloy processed products

JJF1637-2017 Low-cost metal thermocouple calibration specification

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Mechanical melting temperature

Determine the residual stress of the metal material after thermal cycling at different peak temperatures, and form the residual stress and peak temperature curve, and the residual stress reaches the wave The interval between the temperature at the peak and the temperature at which the residual stress drops to the trough, in °C.

Note: On the curve of residual stress and peak temperature, the temperature at the peak is the starting temperature of the mechanical melting point, and the temperature at the trough is the ending temperature of the mechanical melting point.

3.2 Thermal cycle curve

The curve of temperature change with time during heating and cooling.

4 Principles of the method

The testing machine is used to simulate the thermal cycle curve at different peak temperatures during the thermal processing of aluminum alloys, and the residuals at different peak temperatures are measured. Stress, the relationship between residual stress and peak temperature is obtained, and the mechanical melting point of aluminum alloy is obtained by calculation.

5 Apparatus and equipment

5.1 Testing machine

5.1.1 The force measurement system of the testing machine should be calibrated in accordance with GB/T 16825.1-2008, and its accuracy should be level 1 or level 0.5.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 22315-2026|GB/T 6396-2026|GB/T 12347-2025|GB/T 241-2025|GB/T 29459.1-2025|GB/T 29459.2-2025

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