It is the heat affected zone. It differs in every weld. but a good rule of thumb is .25" on either side of the weld
it depends on the fillet welds dimentions and fit up requirements
A fillet weld is a triangular weld with sides of a width, w by w . The throat is the thinnest portion, which is w divided by square root of 2. The throat thickness is used in stress calculations
A fillet weld is the joint of 2 pieces of material, usually at a 90 degree angle. see http://www.unified-eng.com/scitech/weld/fillet.html
Leg of the weld. Fillet is the part you cut off e.g. a corner...
It depends on the thickness and type of materials being welded.
wildly welding main pipe the are fillet weld or butweld
FP on a weld symbol stands for "Fillet weld all around." This means that a fillet weld is required to be made on all sides of the joint where the symbol is placed. The weld size, length, and other specifications should be indicated next to or below the FP symbol on the welding symbol to provide further guidance to the welder. It is important to follow the welding symbol precisely to ensure the weld meets the required specifications and standards.
A fillet weld in any single continuous weldmay underrun the nominal fillet weld size specified by2 mm [1/16 in] without correction, provided that theundersize portion of the weld does not exceed 10% of thelength of the weld. On the web-to-flange welds on girders,underrun shall be prohibited at the ends for a lengthequal to twice the width of the flange.
A fillet weld is the joint of 2 pieces of material, usually at a 90 degree angle. see http://www.unified-eng.com/scitech/weld/fillet.html
In a mitre fillet weld with equal leg lengths, the design throat thickness (T) is typically calculated as 0.707 times the leg length (L). Therefore, the ratio of leg length to throat thickness can be expressed as L/T = L/(0.707L) = 1.414. This means the leg length is approximately 1.414 times the design throat thickness.
The word fillet is used to describe a radius or angle at the joint of an angle instead of a shrap corner. It is sort of like when you use caulk to fill in the sharp corners when you are making a counter top. In a fillet weld you contact both peices of metal being joined at the 90 degree angle to "fill in" the joint.