DAER CONFORMITY ASSESMENT carries out non-destructive testing of welded joints with its quality infrastructure and experienced staff.
Non-destructive testing methods have a wide range of uses in terms of quality assurance of welding works.
Standard Scopes of the Service to be Provided
1Visual Inspection (VT), evaluation and approval of inspection results
Visual Inspection Method ;
It is the oldest of the non-destructive testing methods. Visual inspection is the direct inspection of the material to be tested using the eye or intermediate equipment. Visual inspection is used to detect different surface discontinuities. In order to reach areas where direct eye contact cannot be made, the test is performed using devices such as a boroscope.
Many people think that visual inspection will happen after production is complete. However, the controls made before and during the welding will eliminate the errors that will occur after the welding is finished and will facilitate the end-of-production control process. The main purpose of the controls on the finished weld is to make sure of the quality. Therefore, visual inspection is necessary at this stage.
The checks to be made after welding are basically as follows;
• Source image
• Finished weld dimensions
• Welding Errors
The most important requirement is that the amount of light is at an acceptable level. Before testing, the surface should be cleaned and checked with adequate light. Before this, the production information, working conditions and similar information about the part should be examined.
Advantages
• It is fast and reliable.
• Provides pre-application support to other non-destructive testing methods.
• Allows control of inaccessible places..
• It is an economical control method.
AD 2000 MERKBLATT HP 5/3,TS EN ISO 17635,TS EN ISO 5817,TS EN 10163-1,TS EN 10163-2,TS EN 10163-3,TS EN ISO 17637,TS EN 13018,ASME BPVC I-V-VIII -IX ASME B31.1,ASME B31.3,API 1104.
It is the oldest of the non-destructive testing methods. Visual inspection is the direct inspection of the material to be tested using the eye or intermediate equipment. Visual inspection is used to detect different surface discontinuities. In order to reach areas where direct eye contact cannot be made, the test is performed using devices such as a boroscope.
Many people think that visual inspection will happen after production is complete. However, the controls made before and during the welding will eliminate the errors that will occur after the welding is finished and will facilitate the end-of-production control process. The main purpose of the controls on the finished weld is to make sure of the quality. Therefore, visual inspection is necessary at this stage.
The checks to be made after welding are basically as follows;
• Source image
• Finished weld dimensions
• Welding Errors
The most important requirement is that the amount of light is at an acceptable level. Before testing, the surface should be cleaned and checked with adequate light. Before this, the production information, working conditions and similar information about the part should be examined.
Advantages
• It is fast and reliable.
• Provides pre-application support to other non-destructive testing methods.
• Allows control of inaccessible places..
• It is an economical control method.
AD 2000 MERKBLATT HP 5/3,TS EN ISO 17635,TS EN ISO 5817,TS EN 10163-1,TS EN 10163-2,TS EN 10163-3,TS EN ISO 17637,TS EN 13018,ASME BPVC I-V-VIII -IX ASME B31.1,ASME B31.3,API 1104.
2Radiographic Examination (RT), evaluation and approval of examination results
AD 2000 MERKBLATT HP 5/3,TS EN ISO 17636-1,TS EN ISO 5817,TS EN ISO 10675-1,TS EN ISO 5579,TS EN ISO 12681-1,ASME BPVC I-V-VIII-IX,ASME B31. 1,ASME B31.3,API 1104
3 Ultrasonic inspection (UT), evaluation and confirmation of inspection results
Ultrasonic Inspection Method ;
The principle of ultrasonic testing is based on the basic principle that elastic waves of high frequency (0,1-20 MHz) produced by the probe propagate in the test material medium and are reflected back to the probe after hitting a discontinuity. Among the ultrasonic inspection methods, it is the most used pulse-echo technique in practical life. It is used in welds to find internal welding defects such as slag residues, pores, cracks, non-fusion to the side wall and insufficient penetration. Casting defects, lamination, corrosion, thickness measurement are made with this method.
Advantages
1. Input from only one side of the material,
2. It can be used on many kinds of materials,
3. The most suitable method for finding planar internal discontinuities,
4. Being portable,
5. High penetrating ability
6. Instant results,
7. Adaptability to automatic systems
TS EN ISO 17635, TS EN ISO 11666, TS EN ISO 23279, TS EN ISO 17640, TS EN ISO 16810, TS EN 12680-1, TS EN 10228-3, TS EN 10228-4, TS EN 10160, TS EN ISO 16809, TS EN 10308, TS EN ISO 5817, ASME BPVC I-V-VIII-IX, ASME B31.1,ASME B31.3,API 1104.
The principle of ultrasonic testing is based on the basic principle that elastic waves of high frequency (0,1-20 MHz) produced by the probe propagate in the test material medium and are reflected back to the probe after hitting a discontinuity. Among the ultrasonic inspection methods, it is the most used pulse-echo technique in practical life. It is used in welds to find internal welding defects such as slag residues, pores, cracks, non-fusion to the side wall and insufficient penetration. Casting defects, lamination, corrosion, thickness measurement are made with this method.
Advantages
1. Input from only one side of the material,
2. It can be used on many kinds of materials,
3. The most suitable method for finding planar internal discontinuities,
4. Being portable,
5. High penetrating ability
6. Instant results,
7. Adaptability to automatic systems
TS EN ISO 17635, TS EN ISO 11666, TS EN ISO 23279, TS EN ISO 17640, TS EN ISO 16810, TS EN 12680-1, TS EN 10228-3, TS EN 10228-4, TS EN 10160, TS EN ISO 16809, TS EN 10308, TS EN ISO 5817, ASME BPVC I-V-VIII-IX, ASME B31.1,ASME B31.3,API 1104.
4Evaluation and approval of magnetic particle inspection (MT) inspection results
Magnetic Particle Inspection Method ;
It is well known that magnetic powders are used to determine magnetic flux lines in a magnetic field, for example between two poles of a magnet. Magnetic powders are also used to determine lines of force on the outer surface of a magnetized solid part.
It is used in welds to find internal welding defects such as slag residues, pores, cracks, non-fusion to the side wall and insufficient penetration. Casting defects, lamination, corrosion, thickness measurement are made with this method:
Large surfaces are checked in a short time. Ferro-Magnetic materials and resources are controlled.
It can be used in all kinds of field conditions.
Controls can be made under visible and UV light. Serial production controls can be made in a very short time. It is applied in periodic controls.
The part is placed in the field of a permanent magnet or electromagnet. It constitutes the core of a coil through which direct current flows.
High amperage direct current is passed through the part.
The fact that the magnetic particle test can only be applied to materials that can be magnetized is a feature that limits the application area of this method.
Advantages
1. It is the best method for detecting fine and shallow superficial cracks in ferromagnetic materials.
2. It is a fast and relatively simple method.
3. It can also be applied in the presence of thin paint layers.
4. It has very little restriction in terms of size and shape of the test piece.
5. It is a portable method.
TS EN ISO 17635, TS EN 10228-1, TS EN 1369, TS EN ISO 17638, TS EN ISO 23278, TS EN ISO 5817, TS EN ISO 9934-1, ASME BPVC I-V-VIII-IX, ASME B31.1, ASME B31.3,API 1104.
It is well known that magnetic powders are used to determine magnetic flux lines in a magnetic field, for example between two poles of a magnet. Magnetic powders are also used to determine lines of force on the outer surface of a magnetized solid part.
It is used in welds to find internal welding defects such as slag residues, pores, cracks, non-fusion to the side wall and insufficient penetration. Casting defects, lamination, corrosion, thickness measurement are made with this method:
Large surfaces are checked in a short time. Ferro-Magnetic materials and resources are controlled.
It can be used in all kinds of field conditions.
Controls can be made under visible and UV light. Serial production controls can be made in a very short time. It is applied in periodic controls.
The part is placed in the field of a permanent magnet or electromagnet. It constitutes the core of a coil through which direct current flows.
High amperage direct current is passed through the part.
The fact that the magnetic particle test can only be applied to materials that can be magnetized is a feature that limits the application area of this method.
Advantages
1. It is the best method for detecting fine and shallow superficial cracks in ferromagnetic materials.
2. It is a fast and relatively simple method.
3. It can also be applied in the presence of thin paint layers.
4. It has very little restriction in terms of size and shape of the test piece.
5. It is a portable method.
TS EN ISO 17635, TS EN 10228-1, TS EN 1369, TS EN ISO 17638, TS EN ISO 23278, TS EN ISO 5817, TS EN ISO 9934-1, ASME BPVC I-V-VIII-IX, ASME B31.1, ASME B31.3,API 1104.
5Inspection with liquid penetrant (PT), evaluation and approval of inspection results
Liquid Penetrant Inspection Method ;
It is one of the oldest of the non-destructive testing methods. Making invisible cracks in castings and welds visible by wetting them with oil or diluted lime is a known and applied inspection method for the last century. The method has come so far with some developments. It is a non-destructive testing method that is widely used in the industry today.
If a solid object with cracks on its surface is immersed in a liquid that is not very viscous (Penetrent), its surface gets wet and the cracks are filled with this liquid. After the surface is dried, liquid-filled cracks appear as wet lines. The slight spread of the liquid overflowing from the crack due to adhesion gives an enlarged sign of the crack line. If chalk powder or talcum powder is sprinkled on it in a thin layer after the surface is dried, the enlargement will be greater because they will absorb the liquid left in the crack more strongly. Thus, small cracks that cannot be easily noticed with the naked eye become visible. Specially prepared colored liquids and better absorbent special developers have been developed to increase the contrast. There are also fluorescent types of penetrents. There are types that are washed with water (pre-emulsified), washed with water after being emulsified (post-emulsified), and washed with organic solvents. The time required for penetrents to penetrate cracks varies from a few minutes to twelve hours, depending on conditions. Cleaning the excess penetrents from the surface is the most critical stage of the method. If the cleaning process is taken too far, the penetrant that should remain in the cracks is partially or completely removed. If the cleaning is less, this time the penetrent on the surface will not be completely removed, so the background will be high and the appearance of fine cracks will be masked. Both cases are harmful, reducing sensitivity and reliability.
Advantages
Relatively inexpensive compared to other methods, A portable nondestructive testing method, Very sensitive to thin and adjacent (up to 4 microinches) discontinuities, It is a simple method.
It can be applied to many kinds of materials. Regardless of direction, all surface discontinuities can be detected in one operation.
AD 2000 MERKBLATT HP 5/3,TS EN ISO 17635,TS EN 10228-2,TS EN ISO 23277,TS EN ISO 5817,TS EN ISO 3452-1,TS EN 1371-1,TS EN 1371-2,ASME BPVC I-V-VIII-IX,ASME B31.1,ASME B31.3,API 1104
It is one of the oldest of the non-destructive testing methods. Making invisible cracks in castings and welds visible by wetting them with oil or diluted lime is a known and applied inspection method for the last century. The method has come so far with some developments. It is a non-destructive testing method that is widely used in the industry today.
If a solid object with cracks on its surface is immersed in a liquid that is not very viscous (Penetrent), its surface gets wet and the cracks are filled with this liquid. After the surface is dried, liquid-filled cracks appear as wet lines. The slight spread of the liquid overflowing from the crack due to adhesion gives an enlarged sign of the crack line. If chalk powder or talcum powder is sprinkled on it in a thin layer after the surface is dried, the enlargement will be greater because they will absorb the liquid left in the crack more strongly. Thus, small cracks that cannot be easily noticed with the naked eye become visible. Specially prepared colored liquids and better absorbent special developers have been developed to increase the contrast. There are also fluorescent types of penetrents. There are types that are washed with water (pre-emulsified), washed with water after being emulsified (post-emulsified), and washed with organic solvents. The time required for penetrents to penetrate cracks varies from a few minutes to twelve hours, depending on conditions. Cleaning the excess penetrents from the surface is the most critical stage of the method. If the cleaning process is taken too far, the penetrant that should remain in the cracks is partially or completely removed. If the cleaning is less, this time the penetrent on the surface will not be completely removed, so the background will be high and the appearance of fine cracks will be masked. Both cases are harmful, reducing sensitivity and reliability.
Advantages
Relatively inexpensive compared to other methods, A portable nondestructive testing method, Very sensitive to thin and adjacent (up to 4 microinches) discontinuities, It is a simple method.
It can be applied to many kinds of materials. Regardless of direction, all surface discontinuities can be detected in one operation.
AD 2000 MERKBLATT HP 5/3,TS EN ISO 17635,TS EN 10228-2,TS EN ISO 23277,TS EN ISO 5817,TS EN ISO 3452-1,TS EN 1371-1,TS EN 1371-2,ASME BPVC I-V-VIII-IX,ASME B31.1,ASME B31.3,API 1104
