Chapter 30 Flashcards
Butt joint
consists of placing the edges of two pieces of metal together.
( one of the most frequently used weld joints.
* used when structural pieces have flat surfaces, for example, tanks or flat decks, and when laminating pieces for machine parts.
* There are three types: closed, open, and when laminating pieces for machine parts.
o The closed should be used only if the material to be welded does not exceed 1/8” to 3/16” in thickness.
o When using the open, the joints are spaced 3/32” to 1/8” apart.
* When the material to be welded exceeds 3/16” in thickness, the butt joint should be beveled. There are three types of bevel or V joint designs:
corner joints
Position the pieces in a 90 degree angle and tack both outside corners.
( are often used in the construction of rectangular-shaped objects and where outside corners must have a smooth radius.
* The angle of the electrode is important. The best results are obtained by holding the electrode at 45 degrees with the tip of the electrode pointed at the weld area. The direction of travel will have a 30 degree angle in the traveling direction. On light stock, one bead is usually enough. However, the corner should contain enough weld material to create a smooth radius. This smooth radius will ensure a strong weld and leave the desired finish for the outside corner weld.)
double v
is used for material over 3/8” thick. This joint has a 60 degree bevel; however, a 3/32” to 1/8” face is left in the lower 1/3 of the weld joint. This root face is generally spaced 1/8” apart for proper root pass operation.
feather edge
the material is 1/8” to 3/16” thick, the bevel is 60 degrees, and the bottom edges of the material are placed together.
lap-joints
another of the most frequently used joints in welding. When the metal is lapped it provides great strength.
* Both surfaces of the area must be clean to ensure evenly aligned surfaces.
* The amount depends on the thickness of the material. Generally, the thicker the material the more lap.
* If the joint will be subjected to heavy bending stresses, both edges should be welded.
* will greatly stiffen the object where the material is lapped. This makes a good joint, particularly when large flat sides are part of the structure, as in tanks and bins. It is also an excellent method for making many types of repairs such as fish plating for strengthening other members of a structure or frame.
is a fillet-type weld.
* Both the amount of lap and number of passes required to fill the joint face must be considered.
* Material that is 3/16” or 1/4” should be used for this practice weld. This thickness of material will require a single pass which is one layer of weld to a bead. A 1/8” or 5/32” electrode should be used for this.
* After the material is lapped, you should tack each end before starting the main weld.
* The angle of electrode is particularly important. The best results are obtained by holding the electrode at 45 degrees with the tip of the electrode pointed toward the weld area. The direction of travel will have a 60 degree angle in the traveling direction. This first single pass bead should be 1/4” fillet.
round stock
a variation of the butt joint weld.
o To weld rods or round solid shaft material, both ends of the stock must first be beveled, leaving a shoulder in the center. The edges should be ground so they have the same angle.
shoulder edge
used for materials 1/4” or thicker; 1/16” to 1/8” of the bottom of the material is not beveled and a gap of 1/8” is allowed for the root pass.
tee-joint
formed by placing one plate at a 90 degree angle to another to form a letter T. A tee joint is a fillet-type weld.
- weak and should not be used if heavy pressure will be applied from the opposite direction of the welded joint.
consists of placing the edges of two pieces of metal together.
( one of the most frequently used weld joints.
* used when structural pieces have flat surfaces, for example, tanks or flat decks, and when laminating pieces for machine parts.
* There are three types: closed, open, and when laminating pieces for machine parts.
o The closed should be used only if the material to be welded does not exceed 1/8” to 3/16” in thickness.
o When using the open, the joints are spaced 3/32” to 1/8” apart.
* When the material to be welded exceeds 3/16” in thickness, the butt joint should be beveled. There are three types of bevel or V joint designs:
Butt joint
Position the pieces in a 90 degree angle and tack both outside corners.
( are often used in the construction of rectangular-shaped objects and where outside corners must have a smooth radius.
* The angle of the electrode is important. The best results are obtained by holding the electrode at 45 degrees with the tip of the electrode pointed at the weld area. The direction of travel will have a 30 degree angle in the traveling direction. On light stock, one bead is usually enough. However, the corner should contain enough weld material to create a smooth radius. This smooth radius will ensure a strong weld and leave the desired finish for the outside corner weld.)
corner joints
is used for material over 3/8” thick. This joint has a 60 degree bevel; however, a 3/32” to 1/8” face is left in the lower 1/3 of the weld joint. This root face is generally spaced 1/8” apart for proper root pass operation.
double v
the material is 1/8” to 3/16” thick, the bevel is 60 degrees, and the bottom edges of the material are placed together.
feather edge
another of the most frequently used joints in welding. When the metal is lapped it provides great strength.
* Both surfaces of the area must be clean to ensure evenly aligned surfaces.
* The amount depends on the thickness of the material. Generally, the thicker the material the more lap.
* If the joint will be subjected to heavy bending stresses, both edges should be welded.
* will greatly stiffen the object where the material is lapped. This makes a good joint, particularly when large flat sides are part of the structure, as in tanks and bins. It is also an excellent method for making many types of repairs such as fish plating for strengthening other members of a structure or frame.
is a fillet-type weld.
* Both the amount of lap and number of passes required to fill the joint face must be considered.
* Material that is 3/16” or 1/4” should be used for this practice weld. This thickness of material will require a single pass which is one layer of weld to a bead. A 1/8” or 5/32” electrode should be used for this.
* After the material is lapped, you should tack each end before starting the main weld.
* The angle of electrode is particularly important. The best results are obtained by holding the electrode at 45 degrees with the tip of the electrode pointed toward the weld area. The direction of travel will have a 60 degree angle in the traveling direction. This first single pass bead should be 1/4” fillet.
lap-joints
a variation of the butt joint weld.
o To weld rods or round solid shaft material, both ends of the stock must first be beveled, leaving a shoulder in the center. The edges should be ground so they have the same angle.
round stock
used for materials 1/4” or thicker; 1/16” to 1/8” of the bottom of the material is not beveled and a gap of 1/8” is allowed for the root pass.
shoulder edge
