Back or backing and melt-thru welds are frequently used with groove welds to strengthen the weld on the opposite side of the joint.

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Back or backing welds are commonly used to provide additional support to the weld on the opposite side of the joint, while melt-thru welds are used to join the edges of two pieces of metal together completely. Both types of welds can help to increase the strength and durability of the overall welding joint.

Back or Backing and Melt-Thru Welds Are Frequently Used with Groove