
Quiz Pengelasan
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Other
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University
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Practice Problem
•
Hard
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30 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Porositas menyebar merata sepanjang lasan MAG kemungkinan besar disebabkan oleh:
Aliran gas pelindung terlalu deras
Kecepatan pendinginan terlalu cepat
Material dasar yang tidak cocok
Gas pelindung bocor atau tidak murni
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Mengapa posisi overhead (4G) dianggap sangat menantang dalam pengelasan SMAW?
Busur sulit distabilkan
Terak tidak bisa terbentuk
Gas pelindung terhambur
Logam cair mudah jatuh sehingga mengganggu fusi akar
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Apa penyebab utama hot cracking pada lasan TIG stainless steel austenitik?
Pendinginan terlalu cepat
Busur tidak stabil
Gas pelindung terlalu kuat tekanannya
Kontaminasi sulfur dan fosfor di zona HAZ
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Apa akibat utama dari pengelasan SMAW di luar ruangan dengan kecepatan angin di atas 15 km/jam?
Porositas akibat gangguan gas pelindung
Terak sulit dibersihkan
Meningkatnya spatter
Penetrasi las menurun
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Inklusi terak (slag inclusion) dalam pengelasan SMAW multi-lapisan bisa terjadi karena:
Arus terlalu tinggi
Tidak membersihkan sisa terak antar lapisan dengan baik
Penggunaan gas pelindung yang salah
Pemakaian elektroda yang terlalu kecil
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Mode transfer globular dalam pengelasan MAG cenderung terjadi ketika:
Pulsed current digunakan
Tegangan sangat tinggi dan arus tinggi
Wire feed speed sangat rendah
Digunakan arus rendah dan gas 100% CO₂
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Apa peran utama fitur high-frequency start pada mesin las TIG?
Menghemat energi listrik
Meningkatkan kedalaman penetrasi lasan
Mengurangi ukuran butir pada zona HAZ
Memungkinkan penyalaan busur tanpa menyentuh benda kerja
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