Pemeriksaan Hasil Las DT dan NDT

Summary

In this lecture on welding engineering, the instructor covers the process of analyzing welding errors and defects in manual arc welding (SMAW). The discussion is divided into two main categories of welding tests: destructive and non-destructive. Destructive testing includes methods like mechanical, chemical, and structural testing, while non-destructive testing is explored through techniques such as visual observation, ultrasonic testing, and magnetic particle tests. The benefits and drawbacks of both testing methods are highlighted, emphasizing the ability of destructive tests to detect internal damage and the reusability of non-destructive test samples. The session concludes with an open invitation for students to ask questions.

Takeaways

• 😀 Destructive testing (DT) involves damaging or cutting a specimen to test the mechanical properties and appearance of the weld.
• 😀 Non-destructive testing (NDT) allows for testing without damaging the weld sample, helping detect defects while maintaining sample integrity.
• 😀 The main difference between DT and NDT is that DT damages the sample, whereas NDT does not.
• 😀 Destructive testing includes methods like mechanical testing (e.g., tensile, bending, hardness, impact tests), chemical analysis (e.g., corrosion, water content tests), and structural testing (e.g., macro testing, radiography).
• 😀 Non-destructive testing encompasses methods such as visual observation, ultrasonic testing, radiographic testing, magnetic particle testing, penetrating fluid testing, acoustic emission testing, and voltage measurement.
• 😀 Destructive testing helps detect internal damage and provides accurate information about mechanical properties.
• 😀 Non-destructive testing allows for 100% inspection and enables the tested sample to be reused after the test.
• 😀 There are multiple methods within each type of test. For example, ultrasonic testing has different vibration methods, and radiographic testing can be direct or through fluoroscopy.
• 😀 The speaker emphasizes the importance of understanding both destructive and non-destructive testing for analyzing welding defects effectively.
• 😀 The session concludes with an invitation for students to ask questions via the class WhatsApp group or comment section for further clarification.

Q & A

What are the two main categories of welding testing methods discussed in the lecture?

The two main categories are destructive testing (DT) and non-destructive testing (NDT). Destructive testing involves testing specimens by damaging them, while non-destructive testing does not cause any damage to the specimen.

What is the primary difference between destructive and non-destructive testing?

The primary difference is that destructive testing involves damaging or altering the specimen to test its properties, while non-destructive testing preserves the specimen's integrity, allowing it to be reused after the test.

How many types of destructive testing methods are there, and what are they?

There are three types of destructive testing methods: mechanical testing, chemical analysis, and structural testing.

What are the four methods of mechanical testing in destructive testing?

The four methods of mechanical testing are the tensile test, bending test, hardness test, and impact (growth) test.

What are the three types of chemical analysis in destructive testing?

The three types of chemical analysis are analytical analysis, corrosion testing, and water content testing.

What is structural testing, and how is it categorized in destructive testing?

Structural testing refers to testing the physical structure of the weld and is categorized into two methods: macro testing and micro testing.

How many types of non-destructive testing are mentioned, and what are they?

There are seven types of non-destructive testing: visual observation, ultrasonic test, radiographic test, magnetic particle test, penetrant fluid test, acoustic emission test, and recording measurement.

What are the different methods of ultrasonic testing in non-destructive testing?

The different methods of ultrasonic testing include vertical vibration, oblique vibration, flat vibration, low vibration, and surface vibration.

What are the two methods of radiographic testing in non-destructive testing?

The two methods of radiographic testing are direct biography and two-row copy fluoroscopy.

What are the benefits of destructive testing compared to non-destructive testing?

Destructive testing can more easily detect internal damage and allows for a more accurate determination of mechanical properties, while non-destructive testing allows for 100% inspection and the possibility of reusing the test sample.