TIG welding weld visual inspection standard, weld flaw detection inspection standard

Welding Inspection Standards: GB NDT Terminology Ultrasonic Testing GB NDT Terminology Radiography GB NDT Terminology Penetrant Testing GB ....

ISO5817 is used, which is the standard for general melt welding, and there are detailed regulations for B, C and D welds.

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The weld flaw detection standards are as follows:

1. The first-level and second-level welds must be inspected by flaw detection, and should meet the design requirements and the provisions of the construction and acceptance specifications, and check the flaw detection report of the tung weld.

2. The primary and secondary welds shall not have defects such as cracks, welding tumors, family debate burn-through, arc pits, etc. The secondary weld shall not have defects such as surface porosity, slag inclusion, arc pit, crack, arc abrasion, etc., and the primary weld shall not have defects such as undercut and incomplete welding.

3. The shape of the weld is uniform, the transition between the weld bead and the weld bead, the weld bead and the base metal is smooth, and the welding slag and spatter must be cleaned.

4.Surface porosity:

1) Grade welds are not allowed; The allowable diameter of the weld is per 50mm length of the weld; and 2 3mm pores; Stomatal spacing: 6 times the pore size. Undercut: Grade welds are not allowed.

2) Grade weld: undercut depth, and continuous length of 100mm, and the total length of the undercut on both sides is 10% of the weld length.

3) Grade weld: undercut depth, and lmm.

Hazards of flaw detection to the human body:

1. Flaw detection is mainly used to detect cracks and defects inside the metal, and commonly used flaw detection methods, including X-ray or ultrasonic, gamma ray, etc., have radioactive substances. During flaw detection, if the human body is not well protected, the above-mentioned rays will cause certain harm to the human body, and long-term exposure to radiation will have a greater impact on the human body.

2. If the human body is in the radiation range of flaw detection for a long time, it can lead to energy metabolism disorders in the body cells and make the limbs weak. If you are often exposed to flaw detection and do not do a good job of protection, the radiation of flaw detection will destroy human cells and tissues, resulting in human cell mutation, which will have a great impact on the human reproductive system, blood system, and nervous system, such as causing infertility. And the risk of cancer will be several times higher than that of people who work in a normal environment, which may cause liver cancer, breast cancer, etc.

It can also lead to blood diseases, optic nerve damage, hearing damage, etc.

3. Therefore, in order to prevent serious damage to the human body caused by flaw detection, it is recommended to wear protective clothing and gloves during flaw detection operation, and it is necessary to avoid working for too long. At the same time, the work should be as far away from the radiation source as possible, and the operation area should be equipped with an effective shielding device. <>

1. The weld must be inspected by flaw detection, and should meet the design requirements and the provisions of the construction and acceptance specifications.

2. The grade weld shall not have defects such as cracks, welding nodules, burn-through, arc pits, etc. The grade weld shall not have surface porosity, slag inclusion, arc pits, cracks, arc abrasions and other defects.

3. The shape of the weld is uniform, the transition between the weld bead and the weld bead, the weld bead and the base metal is smooth, and the welding slag and spatter are removed from the dry macro number.

4. Surface pores: grade weld: undercut depth, and continuous length of 100mm, and the total length of the undercut on both sides is 10% of the length of the weld.

Introduction to Welds:

The edge of the connecting plate does not need to be finished, the plate is seamless, and the weld metal is directly filled in the area of the right angle or bevel formed by the two weldments.

In order to facilitate the construction of the first cavity of the cavity, ensure the quality of construction, and ensure that the butt weld is full of base metal gaps, different groove forms are taken according to the thickness of the steel plate, and when the gap is too large (3 6mm), a backing plate (arc striking plate) can be set under the V-shaped seam and unilateral V-shaped seam and I-shaped seam to prevent the flow of molten metal and make the root welded through.

In order to ensure the quality of welding, prevent the grooves at both ends of the weld, and reduce the influence of stress concentration on the dynamic load, after the weld is formed, the two ends can be left on the weldment unless it does not affect its use, otherwise it should be cut off after the welding is completed. <>

Visual inspection of welds is done by directly observing the identification of defects with the eyes. Under normal circumstances, the distance of visual inspection is about 600mm, and the angle of view between the eye and the surface of the inspected workpiece is not less than 30 °.