Definition
A gas welding technique in which the torch flame is pointed back toward the finished weld, with the filler rod held between the flame and the completed bead. The welder moves the torch and rod from left to right (for a right-handed welder), so the flame travels over the weld already laid down.
Plain English
A way of welding where the flame points backward at the finished part of the weld, and the welder works away from it. The flame keeps reheating the weld behind the torch as the welder moves forward.
Context Anchor
Seen in aircraft metal repair discussions, especially when comparing gas-welding methods for different metal thicknesses.
Derivation
Called 'backhand' because the torch flame is directed back toward the weld already made, opposite to 'forehand' welding where the flame points forward into unwelded metal.
Why Pilots Care
Mechanics and builders use backhand welding on thicker materials because it puts more heat into the joint and gives better penetration. Knowing the difference between backhand and forehand technique matters when inspecting or specifying repairs to welded aircraft structure.
Grounding Statement
Picture the torch moving forward along a seam while the flame leans back over the bead that was just made.
Intuition Check
Backhand does not mean using the back of your hand or your non-dominant hand. In welding, it means the flame is aimed backward toward the completed weld.
Example Sentence 1
The technician used backhand welding on the 4130 steel tubing to get deeper penetration on the thick-walled joint.
Example Sentence 2
Backhand welding reduced distortion when joining thin aluminum sheets on the fuselage.