chapter 4 Flashcards
Spliced Joint
A joint in which an additional workpiece spans the joint and is welded to each joint member
Fillet welds info?
Triangle cros section
(lap, T or corner joint)
Intermittently, staggered, or chained
Edge preparation are usually not required for fillet welding
Stud welds
Used mostly with Low carbon steel, stainless steel and aluminum
Most stud welds are round
Back Weld
applied after the front side weld
weld made in the back side a joint
Backing weld
is backing in the form of a weld
deposited before welding the front side
Surface welds
Welds applied to surface
Buildup
Buttering
Cladding
Hard facing
Surface welds - Buildup
Adding material to achieve a required dimension
Surface welds - Buttering
Provide metallurgical compatible weld metal for subsequent completion of a weld
Surface welds - Cladding
Improve corrosion or heat resistance
Surface welds - Hard facing
Reduce wear
Fusion
Melting together of the filler metal and the base metal
Penetration
the distance that the weld metal has progressed into the joint
Theoretical throat
The minimum amount if the weld that the designer counts on when originally specifying the weld size
The distance from the beginning of the joint root perpendicular to the hypotenuse
minimum distance minus convexity between the weld root and the face-off the fillet weld
Actual Throat
the shortest distance between the weld root and the face of the fillet weld
Stringer bead
Little or no side to side motion weld bead
Weave bead
Electrode moved side to side along the groove
Boxing
the continuation of a fillet weld around a corner of a member as an extension of the principal weld
Backstep sequence
Each weld pass is deposited in the direction opposite that of the overall progression of welding
The Block sequence
Combined longitudinal and cross section
some parts are welded before the intervening increments are welded
Each subsequent layer is slightly SHORTER then that of the previous one so that is created a gentle slope
Cascade Sequence
Combined longitudinal and cross section in which weld passes are made in overlapping layers
Each subsequent layer is slightly LONGER then that of the previous one
Finish Modes C G H M R U
Chipping Grinding Hammering Machining Rolling Unspecified
The melt through symbol is used only when?
complete root penetration plus visible root reinforcement is required
The hight requirement of root reinforcement is specified left of the melt through symbol on the reference line
Backing
Material or device placed on the backside of the groove
The material and the dimensions are specified in the tail
An r is placed in side if it need to be removed later
Consumable Insert
Used with GMAW
used as special composition filler
Symbol is a square on the opposite side of the reference line
The class type is in the tail of the symbol
