Comparison of different standards on the grade of casting defects
The acceptance specifications of steel castings have realized that the outer surface of steel castings is more important, because the […]
The acceptance specifications of steel castings have realized that the outer surface of steel castings is more important, because the […]
Casting is a process for producing products with liquid metal. The basic technology in mechanical industry includes manufacturing, welding, forging
The basic cause of concentrated shrinkage defects in castings is that the liquid shrinkage and solidification shrinkage of the alloy
Firstly, the basic process flow of trial production of coupler products, the main process equipment and process methods used by
In terms of detection methods, GB7233-09 focuses on the near-field area of ultrasonic flaw detection, and adds a near-field resolution
The cracks of the motor shell are typical thermal cracks. There are more than 40 cracks and more than 80
The total number of cracks in the motor shell produced by furan resin sand casting process is about 70, while
According to the previous casting simulation results, it is found that the process riser of the steel casting plant is
The sand inclusion casting defects of steel castings are relatively serious, because the proportion of product scrapping caused by sand
The orthogonal experiment will be designed, the riser height is set as the independent variable, and other process parameters remain
(1) Ultrasonic flaw detection of cast steel joints can not cover all flaw detection areas, nor can it completely and
Casting sand inclusion defects are directly related to production process, mold, sand mixing, molding, core making, lower core box, pouring
(1) Through the non-destructive testing of 24 cast steel joints, it is found that the distribution of casting defects seems
According to the flaw detection results, there are many casting defects in the cast steel joints, and many casting defects
The ultrasonic testing standard for carbon steel, low alloy steel and martensitic stainless steel castings (astm-609 / 609m), ultrasonic testing
According to the relative position of the internal sprue on the steel casting, the casting system can generally be divided
The new and old specifications of steel castings in China, methods for ultrasonic flaw detection and quality assessment of steel
Hot crack defect refers to the casting defect when the solid rate of steel castings is close to 1.0 at
In order to verify the nondestructive ultrasonic flaw detection test results of typical four branch cast steel joints, take four
1. Test purpose (1) The random characteristics of typical casting defects distribution of cast steel joints are analyzed; (2) Verify
The larger the hot brittle zone of the alloy, the greater the shrinkage of the casting in this temperature range,
The above research on the mechanical properties of cast steel joints and the mechanical properties of cast steel joint welds
Ultrasonic flaw detection can only qualitatively analyze casting defects, but can not accurately describe defects. There are many scanning blind
The formation mechanism of hot tears casting defects mainly includes liquid film theory and strength theory. According to the liquid
According to the constancy of sound velocity propagation in the same medium and the proportional relationship between propagation distance and
The appearance characteristics of hot tears casting defects are that the tears propagates along the grain boundary, the appearance is
The causes of cracks and sand inclusion defects in motor shell steel castings are studied from the perspective of process
Cast steel joints will inevitably produce some defects in the production process, such as hot crack, shrinkage cavity, delamination, slag
Ultrasonic flaw detection mainly detects the near surface and internal quality of steel castings, and the internal quality of steel
With the development of spatial structure, the span of structure is becoming larger and larger, and the forms are also