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Video: Automatic butt-welding machine. Butt welding is when two pieces of metal are placed end-to-end without overlap and then welded along the joint (as opposed to lap joint weld, where one piece of metal is laid on top of the other, or plug welding, where one piece of metal is inserted into the other).
Normally a hole is drilled into the base material and a fastener is placed inside. This type of joiner requires some type of overlapping material for a joint to be made. Aluminium rivets or bolts and nuts can be used; however, high-stress applications would require higher strength fastener material such as steel.
The tapers are generally cut at an angle between 1:8 to 1:10. The ends of a plain scarf are feathered to a fine point which aids in the obscuring of the joint in the finished work, while in other forms of scarf the ends are frequently cut to a blunt "nib" which engages a matching shoulder in the mating piece.
The joining technology is used in any type of mechanical joint which is the arrangement formed by two or more elements: typically, two physical parts and a joining element. The mechanical joining systems make possible to form a set of several pieces using the individual parts and the corresponding joining elements.
This hole is stopped 1 ⁄ 4 in (6.4 mm) or so from the edge of the frame member. The second step is to drill a pilot hole concentric with the pocket hole which extends through the edge of the member. The pilot hole allows the screw to pass through the member and into the adjoining member.
The clearance between the bolt and the holes means that some lateral movement may occur before the bolt bears against the sides of the holes. Even when designed as a bearing joint, the surface friction between the clamped elements may be sufficient to resist movement for some time, especially when the building may not yet be fully loaded ...
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This is the most common form of end lap and is used most in framing. For a half lap in which the members are parallel, the joint may be known as a half lap splice. This is a splice joint and is an alternative to scarfing when joining shorter members end to end. Both members in an end lap have one shoulder and one cheek each. Use for: