This standard specifies the method and evaluation criteria for ultrasonic longitudinal wave diameter inspection of bimetallic friction welded valve rods for welding defects. This standard is applicable to bimetallic friction welded valve rods for reciprocating piston internal combustion engines with cylinder diameters below 200mm. It can also be used as a reference for ultrasonic flaw detection of semi-finished and finished valves. JB/T 5093-1991 Technical Conditions for Ultrasonic Flaw Detection of Friction Welded Valves for Internal Combustion Engines JB/T5093-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T5093-91
Ultrasonic flaw detection of friction welded valves for internal combustion engines
Technical conditions
Published on July 1, 1991
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Implemented on July 1, 1992
Mechanical Industry Standard of the People's Republic of China
Ultrasonic flaw detection of friction welded valves for internal combustion engines
Technical conditions
Subject content and applicable model drawings
JB/T5093--91
This standard specifies the method and evaluation criteria for ultrasonic longitudinal wave direct inspection of welding defects of bimetallic friction welded valves. This standard is applicable to bimetallic friction welded valve rods for reciprocating piston internal combustion engines with a cylinder diameter of less than 200mm. It can also be used as a reference for ultrasonic flaw detection of semi-finished and finished valves. 2 Reference standards
ZBY230A type pulse reflection ultrasonic flaw detector General technical conditions JB4008 Liquid immersion ultrasonic longitudinal wave direct flaw detection method JB4009 Contact ultrasonic longitudinal wave direct flaw detection method 3 Terminology
3.1 Surface defects, defects with edges that coincide with the surface (such as surface cracks, unfused, slag inclusions, etc.). 3.2 Internal defects: defects with edges that do not coincide with the surface (such as internal cracks, unfused, inclusions, etc.). 4 Instruments, probes and coupling agents
4.1 Flaw detector
A type pulse reflection ultrasonic flaw detector, the instrument performance should comply with the provisions of ZBY230. 4.2 Probe
4.2.1 The contact method uses a longitudinal wave straight probe with a diameter of 12~14mm and a frequency of 2.5MHz. 4.22 The immersion method uses a water-immersed straight probe with a diameter of 14~18mm and a frequency of 5MHz. 4.3 Coupling agent
4.3.1 When using the contact method for inspection, use clean engine oil as a thickener. 4.3.2 When using the liquid diffusion method for inspection, use water as a coupling agent. 5 Comparison test block
5.1 The comparison test block is made of the same material as one end of the flaw detection surface. The material shall not have defects when tested with a sensitivity of $2-22dB. 5.2 The shape and size of the comparison test block are shown in the figure. Its artificial defects are equivalent to 1.5mm flat-bottomed holes. 5.3 In order to accurately determine defects, other types of comparison test blocks with equivalent effects can also be used. Approved by the Ministry of Machinery and Electronics Industry on July 1, 1991, and implemented on July 1, 1992
Note: L-length of the test piece
6 Inspection method
6.1 Selection of the test surface and requirements for the test pieceJB/T5093-91
1 ± 0, 05
80 ± 0, 10
L ± 0. 15
6.1.1 The test surface should generally be the end face of one end of the martensitic bar. 6.1.2 No burrs are allowed around the test surface, and the chamfer should be less than or equal to 0.5mm. 6.1.3 Surface roughness of the test surface R, 1.6um. 6.1.4 Surface roughness of the rod R, 2.5μm. 6.2 Instrument adjustment
6.2.1 Adjustment of time base range
The adjustment of time base range is carried out on the comparison test block, and the reflected wave at the bottom of the bar should be displayed. 6.2.2 Adjustment of flaw detection sensitivity
The adjustment of flaw detection sensitivity is carried out on the comparison test block, so that the artificial defect is high and the reflected wave is as high as 50% of the full amplitude of the fluorescent screen. Then, according to the maximum requirement of the defect of the inspected piece, the decibel difference of the sensitivity required by the comparison test block and the inspected piece is calculated, and the decibel difference obtained by the attenuator gain is the sensitivity required by the inspected piece. 7 Inspection
7.1 Use the height of the reflected wave of the welding interface defect to inspect internal defects. 7.2 Surface defects are inspected based on the phenomenon that the surface defects cause the weakening of the reflected wave and the increase and enhancement of the late wave at the welding interface, as well as the height of the above two waves.
7.3 During the inspection process, the run-in of the flaw detector, probe, etc. should be checked regularly. The inspection should also be done at the beginning and end of the work. If it is found that the adjustment is incorrect or the equipment is faulty, it should be calibrated and corrected. All the inspected parts that have been inspected before the problem is found should be re-inspected. 8 Evaluation standard
The evaluation of internal defects in the welding interface is based on the highest reflection wave of the defect on the fluorescent screen. The diameter of the flat bottom hole of the defect should be 8.1
less than 0.15D (D is the diameter of the inspected part). Www.bzxZ.net
JB/T5093-91
8.2 Surface defects that cannot be removed during processing are not allowed to exist on the welding interface. Inspection report
An inspection report should be written after the flaw detection, and the inspection report should include the following contents: a.
Name, model, size and material of valve ladder material: adopted standard:;
Flaw detector model, probe type and piece size, frequency: flaw detection method and coupling agent;
Flaw detection sensitivity;
Flaw detection results:
Name of flaw detection technician and operator, flaw detection date, etc. Others
Matters not specified in this standard shall be in accordance with the relevant provisions of JB4008 and JB4009. Additional notes:
This standard was proposed and coordinated by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery and Electronics Industry and Chaobei Valve Factory.
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