ASME Section IX - QW150 Voltage Tests

Developed by the American Association of Mechanical Engineers (ASME), the QW150 standard describes a tensile testing method. The full name of the standard is as follows: QW150 Tensile test examples, procedure and acceptance.

The ninth part of the standards published by the American Mechanical Engineers Association and updated in 2019 is the boiler and pressure vessel covers international codes. This section describes the qualification criteria for welders, solders and welding, soldering and melting operators, as well as welding, soldering and melting processes.

Accordingly, the structure of the QW150 standard is as follows:

• QW-151 Samples: Tension test samples must conform to one of the types shown in the figures and meet the requirements of QW-153.
• QW-152 Tensile test procedure: Tensile test specimen should be torn under tensile load. The tensile strength should be calculated by dividing the final total load into at least the cross-sectional area of ​​the sample as calculated from the actual measurements made before the load is applied.
• QW-153 Acceptance criteria - Tensions: The lowest tensile strength values ​​of the basic materials required for the procedure qualification are given in the table. The table contains acceptance criteria for tensile testing. If the sample reaches the lowest tensile strength before breaking, it must be considered to meet the requirements. If the sample breaks in the base metal outside the weld or weld interface, it must be considered that the strength meets the requirements if the strength is not less than 5 percent of the specified minimum tensile strength.

In order to understand how the materials will react under the tensile load, tensile tests are carried out. In a simple tensile test, the material sample is drawn towards the breaking point to determine the ultimate tensile strength of the material. Material properties are usually expressed by the following two values:

• Voltage: force per unit area
• Strain: percentage change in length

Among the services provided by our organization within the framework of metallic testing services, there are also QW150 standard tests.