Usfd manual

Ultrasonic testing of rails was introduced over Indian Railways during early 60s.

Disclaimer: This Compilation is for educational reference only. For details refer original correction slips. Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, this technique has graduated itself to an extent that today it is one of the most powerful tools of preventive maintenance of the permanent way. During the last 40 years of its existence, a large number of testing procedures, specifications, guidelines and criteria have been issued from time to time based on the experience gained. The advent of fracture mechanics concept coupled with state of the art steel making technology has thrown open a new dimension in the periodicity of ultrasonic examination.

Usfd manual

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Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, this technique has graduated itself to an extent that today it is one of the most powerful tools of preventive maintenance of the permanent way. During the last 40 years of its existence, a large number of testing procedures, specifications, guidelines and criteria have been issued from time to time based on the experience gained. The advent of fracture mechanics concept coupled with state of the art steel making technology has thrown open a new dimension in the periodicity of ultrasonic examination. The rate of crack propagation and fracture toughness characteristics of rails can be experimentally found which determine the critical crack size. Based on the above knowledge and experience, it was considered necessary to assimilate the entire information on ultrasonic examination of rails and present in the form of a manual so as to guide the ultrasonic personnel in testing, interpretation and decision-making. Subsequently, a revision was issued in in view of the experience gained in the field of USFD testing and maintenance practices.

Usfd manual

Disclaimer: This Compilation is for educational reference only. For details refer original correction slips. Ultrasonic testing of rails was introduced over Indian Railways during early 60s. From a humble beginning, this technique has graduated itself to an extent that today it is one of the most powerful tools of preventive maintenance of the permanent way. During the last 40 years of its existence, a large number of testing procedures, specifications, guidelines and criteria have been issued from time to time based on the experience gained. The advent of fracture mechanics concept coupled with state of the art steel making technology has thrown open a new dimension in the periodicity of ultrasonic examination. The rate of crack propagation and fracture toughness characteristics of rails can be experimentally found which determine the critical crack size.

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Also it has computer for tabulating, printing and storage of data. There is a possibility that the spurt car may have been calibrated on conventional threshold values of defect size in rail while the Need Based concept of USFD testing of rails based on a different defect size in rail has already been introduced in the section being tested. These are reproduced below:. Mere appearance of moving signal during flange testing of weld shall not be the criterion for rejection of a joint. Diagonal at hole rail head 8. Para 8. Provision of 0. Building up 8. In order to examine the entire width of rail head as well as the height, maximum mutual displacement at start shall be 70mm. Rectangular block of 60 mm x50 mm x 50 mm steel to 45C8,IS shall be used. Similar testing shall be carried out from C and U region as shown in Fig. Method of Testing 3. Annexure II Para 6. Analysed by computer hence less strenuous.

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These rails, therefore, do not have any chance of fish bolt hole cracking or any progressive type of defects. Horizontal 5. They result from inadequately maintained joints and unchamfered fish boltholes and stress concentration. The flange of the weld up to a distance of mm. The flawed portion should be replaced by a sound tested rail piece of not less than 6m length within 3 days of detection. Description Page no. Date of change of last probes : ……………………………………………………. It cannot be easily detected in early stages by USFD due to their unfavourable orientation. This is supplied through a water container attached with the trolley. For multichannel equipment, select the calibration set and channel required to calibrate. This Chapter covers the requirement of complete ultrasonic testing of Aluminothermic welded rail joints by hand probing immediately after execution of the weld described at c above and for periodic examination of complete weld described at b above only. Note : Guidelines for the Operators: a The correctness of angles and index marking of the probe shall be ascertained before testing. Cables: Co-axial cable for each probe shall be used.