19 When backing plate strips are made of the same material as the base metal, which groove angle should be used for welding? 30 degrees 45 degrees 60 degrees 90 degrees

When backing plate strips are made of the same material as the base metal, a 90-degree groove angle should be used for welding. This angle provides the best penetration and fusion between the base metal and the backing plate, ensuring a strong and durable weld.