Purpose of welding inspection ruler

The welding inspection ruler is mainly composed of three parts: the main ruler, slide ruler, and diagonal ruler. It is a specialized measuring tool used to measure the angle of the weld groove, the width and height of the weld seam, and the welding gap.

application area

1) Pre welding inspection

Pre welding inspection includes inspection of raw materials (such as base materials, backing plates, etc.), inspection of welding structure design, etc.

2) Inspection during welding process

This includes inspection of weld size, fixture condition, and structural assembly quality.

3) Inspection of finished products after welding

There are many methods for inspecting finished products after welding, and the following are commonly used:

(1) Appearance inspection

The appearance inspection of welded joints is a simple and widely used inspection method, which is an important part of finished product inspection, mainly to discover defects and dimensional deviations on the weld surface. Generally, inspection is carried out through visual observation, using tools such as standard templates, gauges, and magnifying glasses. If there are defects on the surface of the weld, there is a possibility of defects inside the weld.

(2) Tightness inspection

Non dense defects such as penetrating cracks, pores, slag inclusions, incomplete penetration, and loose structure in the welds of welded containers for storing liquids or gases can be detected through density testing. The density inspection methods include kerosene test, water loading test, water flushing test, etc.

(3) Strength inspection of pressure vessels

In addition to conducting sealing tests, pressure vessels also need to undergo strength tests. There are two common types: hydraulic test and pneumatic test. They can all inspect the tightness of welds in containers and pipelines working under pressure. Pneumatic testing is more sensitive and rapid than hydraulic testing, and the tested product does not require drainage treatment, making it particularly suitable for products with difficult drainage. But the danger of testing is greater than that of hydraulic testing. When conducting tests, corresponding safety technical measures must be followed to prevent accidents from occurring during the testing process.

(4) Verification of physical methods

The physical inspection method is the use of some physical phenomena for measurement or inspection. The inspection of internal defects in materials or workpieces generally adopts non-destructive testing methods. Non destructive testing includes ultrasonic testing, radiographic testing, penetrant testing, magnetic testing, etc