Ktp

Figure 8.4: Fillet welded lap connection

(2)P If a combination of end fillets and side fillets is used in the same connection, its total resistance shall be taken as equal to the sum of the resistances of the end fillets and the side fillets.

(3)P The effective length L^ of a fillet weld shall be taken as the overall length of the full-size fillet, including end returns. Provided that the weld is full size throughout this length, no reduction in effective length need be made for either the start or termination of the weld.

(4) Fillet welds with effective lengths; less than 8 times the thickness of the thinner connected part should not be designed to transmit any forces.

8.6.3 Arc spot welds

(1)P Arc spot welds shall not be designed to transmit any forces other than in shear.

(2)P Arc spot welds shall not be used through connected parts or sheets with a total thickness Zt of more than 4 mm, or where the thinnest connected part or sheet is more than 4 mm thick.

(3)P Arc spot welds shall have an effective diameter deff of not less than 10 mm.

(4)P If the connected part or sheet is less than 0,7 mm thick, a weld washer shall be used, see figure 8.5.

(5)P Arc spot welds shall have adequate end ┬┐and edge distances.

Connect part or shee

Connect part or shee

Figure 8.5: Arc spot weld with weld washer

Supporting member

Figure 8.5: Arc spot weld with weld washer

(6) The design shear resistance Fw Rd of a circular arc spot weld should be determined as follows:

where:

/uw is the ultimate tensile strength of the welding electrodes; but Fw Rd should not be taken as more than the peripheral resistance given by the following:

0,17(dp + 164eEt)ZtfJym

(7) The interface diameter ds of an arc spot weld, see figure 8.6, should be obtained from:

where:

= 0,7rfw - l,5Er is the visible diameter of the arc spot weld, see figure 8.6.

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