Latihan Soal Las Kelas X Teknik Pemesinan

The correct answer is "Topeng las." This is because a welding mask is specifically designed to protect the eyes and head from harmful UV rays, infrared radiation, gases, and sparks that are produced during the welding process. Welding masks are equipped with a special darkened lens that filters out the intense light emitted during welding, preventing damage to the eyes. Additionally, the mask provides coverage for the head and face, offering protection against sparks and debris. Therefore, a welding mask is the appropriate choice for protecting the eyes and head in welding operations.

Klem masa adalah salah satu perlengkapan las yang berfungsi untuk menghubungkan kabel massa ke benda kerja. Kabel massa digunakan untuk mengalirkan arus listrik ke benda kerja sehingga dapat terjadi proses pengelasan. Dengan menggunakan klem masa, kabel massa dapat dipasang dengan aman dan kuat pada benda kerja sehingga arus listrik dapat mengalir dengan baik dan stabil selama proses pengelasan.

Mesin las arus AC menggunakan sumber arus bolak-balik fase tunggal. Arus bolak-balik fase tunggal adalah jenis arus listrik yang memiliki satu fase dan berubah arah secara teratur. Mesin las ini cocok digunakan untuk pengelasan pada material yang memiliki konduktivitas listrik yang tinggi, seperti logam.

The correct answer is AC. This is because AC (alternating current) is more commonly used in electric arc welding due to its cost-effectiveness and ease of use and maintenance. AC allows for the welding current to alternate in direction, which helps to prevent the electrode from sticking to the workpiece and allows for better control of the welding process. DC (direct current) can also be used for electric arc welding, but it is less commonly used compared to AC. AC/DC is not a suitable answer as it does not specify a preference for either AC or DC. The options "Kecil" and "Besar" do not provide a relevant explanation for the choice of AC.

The correct answer is No. 5. The size of the welding glass used for spot welding is usually No. 5. This is because No. 5 welding glass provides sufficient protection against the intense light and heat generated during spot welding, while still allowing the welder to see the workpiece clearly. Using a higher or lower number may result in inadequate protection or poor visibility, respectively.

The correct answer is No. 14. The number on the glass lens refers to the shade or darkness level of the lens. A higher amperage requires a darker lens shade to protect the eyes from the bright light produced during welding. A shade number 14 is suitable for welding above 400 amperes as it provides a higher level of protection against the intense light.

The correct answer is ASTM because ASTM stands for the American Society for Testing and Materials. It is an international standards organization that develops and publishes technical standards for a wide range of materials, products, systems, and services. The use of the letter "E" followed by four or five numbers is a standard labeling system used by ASTM for identifying different types of electrodes.

The correct answer is No. 10. The number on the glass lens indicates the shade or darkness level of the lens. For welding with an amperage range of 75-200 Ampere, a shade 10 lens is recommended. This shade provides enough protection from the intense light and harmful radiation produced during welding, ensuring the safety of the welder's eyes.

The correct answer is Las Busur gas MIG. In MIG welding, a wire electrode is fed through a welding gun and is melted to join two pieces of metal together. The wire electrode also acts as a filler material to create a strong bond between the metals. The use of a shielding gas, typically a mixture of argon and carbon dioxide, protects the weld from contamination and ensures a clean and strong weld.

The given options are different types of electric arc welding processes. "Las Busur GIG" is not a recognized type of electric arc welding process.

The correct answer is Las Busur gas TIG. Las Busur gas TIG menggunakan elektroda tungsten yang tidak berfungsi sebagai bahan tambah. Elektroda tungsten digunakan untuk membentuk busur listrik yang panas dan stabil, sedangkan bahan tambah las (seperti logam pengisi) harus ditambahkan secara terpisah.

Pengkutuban langsung adalah metode pengelasan di mana elektroda ditempatkan di antara dua benda kerja yang akan dielas. Metode ini menghasilkan penembusan yang dangkal dan cocok untuk mengelas pelat-pelat yang tipis karena panas yang dihasilkan oleh elektroda terkonsentrasi di antara dua benda kerja yang saling menyatu. Metode pengkutuban langsung juga memungkinkan pengelasan yang lebih presisi dan kontrol yang lebih baik terhadap proses pengelasan.

The term often used to describe the electrode polarity in arc welding with negative electrode is "direct polarity".

The correct answer is "Las Busur Rendam". This is because "Las Busur Rendam" uses powder flux as its protective material.

The correct answer is "Pengkutuban terbalik". This is because a circuit with a positive electrode in arc welding is often referred to as "reverse polarity". In reverse polarity, the positive electrode is connected to the workpiece, while the negative electrode is connected to the power source. This configuration allows for deeper penetration and higher welding speeds compared to direct polarity, where the negative electrode is connected to the workpiece.