The Final Fillet Weld

Semester ii final assessment soran university faculty of engineering civil engineering department module title/ stage: steel design ii fourth stage module leader: dr. kamaran s. ismail name of student: 1st attempt date of final assessment: 28th june 2020 date and time for report uploading: 30th june 2020 11:30pm fillet welded connection abstract or summary the keywords: lateral list of contents the introduction or background welding is one of the ways to connect structural elements. during welding a metallic bond is created between the structural members.

welding is one of the oldest and most reliable methods of connection and during the period from 1880 to 1900 the intensity of the developed work increased due to the availability of electric generators to replace the batteries. today several welding processes are available for joining various metals and their alloys. the type of weld fillet weld is discussed in this report. fillet weld is provided when two connected elements are different planes and are most widely used because of their economy ease of manufacture and suitability for use on site this situation is often found inside structures.

When elements can overlap higher mounting tolerances are allowed fillet welds are used therefore fillet welds are suitable for knee and t-joints. the shape of fillet weld is triangular and could have a concave flat or convex surface liable on the welding method. this triangle will under or over a flat line through an arrow extending from a flat line representing the connection. welders usage fillet welds while connecting flanges to cylinders and segments of the welding substructure besides when bolts are not tough enough and wear simply.

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in addition tests have shown that fillet welds are more tensile and compressible than welds so the test filament stresses listed in the various specifications are shear stresses. if necessary it is advisable to try to arrange the welded joints so that they are subjected only to shear stresses and not to a combination of shear and tension or shear and compression. each fillet weld consist 5 section known as root toe face leg and throat. there are also signal that describe the graphics of the weld.

A soft curve directing away from the hypotenuse incomes a concave seam and a convex seam. manipulate either by the welding technique or by using mechanical or crushing tools after welding is completed the surface of the weld canister. the size of the weld can be measured in various methods for example the length of the weld the measurement of the legs of the weld and the gaps between the welds. in the connecting element they usually intersect at right angles but an intersection angle of 60 to 120 can be used. main body welding is widely used when connecting beams to columns of steel frames; as a rigid joint the metal fellet welding process is used to join steel structures. welding methods are one of the most important and commonly used methods for joining parts in industry. welded joints are used in almost all industries depending on various applications and where a constant connection with high strength is required. in some cases welded joints are used: structural supports automobile joints pipeline industry pressure vessels etc.

Recent industry trends have focused on high strength and hard welds for various metals with the development of welding technology. any information on the shape size and residual stress of the welded element is of particular interest to improve quality today. well-known weld analysis procedures are based on simplifying assumptions commonly used to produce results that in most cases are accurate enough for technical applications. welding eliminates the need to make holes in the elements with the exception of a few used for installation. welds can be grouped into four types of groove fillet slot and plug. filet weld is a widespread template figure. 1 show fillet weld connection. fillet weld connection the fillet weld has an approximately triangular cross section and several examples of the use of fillet welds are shown. 2. in the connecting element they usually intersect at right angles but you can use the intersection angle from 60 to 120 provided that the correct neck size is used in the calculations and it is assumed that the filled seam breaks when sheared.

We have mant joint in the weld which is include butt lap tee edge corner etc. figure. 3 show the type of joint. figure. 3. type of joints the effective size of the neck stays the shortest space from the root of the surface of the weld the effective depth of the neck would be at least 3 mm and should not exceed 0.707a where a is the size of the weld. in mm therefore if the fillet welds are of unequal length the theoretical throat value should be calculated from the schematic shape of the weld. in general the effective neck thickness is the height of the triangle inscribed in the weld which has its base along the free border of the seam. uneven fillet welding on the legs is used when the vertical leg of the weld cannot be increased. for example when attaching a channel used as a shear connector in a composite structure over a beam flange. the vertical support is limited by the thickness of the flange at the outer edge of the channel.

additional strength can be obtained by increasing the horizontal leg of the fillet. t t= 0.707a t theoretical throat= a a b b the desired seam has a flat or slightly convex surface while the convexity of the seam does not increase its design strength. in addition it seems that the surface gives the ideal shape of the fillet weld since stresses can apparently smoothly and evenly pass along the corner with a small concentration of stresses. the concave shape of the fillet weld is more prone to cracking upon cooling and this factor is more important than the distribution of the suffocating stress of a convex type. when the concave seam contracts the surface stretches. which tends to cause cracks. in addition when the surface of the convex weld is compressed this does not stretch the outer surface since the surface narrows it contracts. concave is larger than a convex weld. however concave angle welding is used for design because they thought it offers a smooth flow of stress. it is usually said that the stress in a fillet weld is equal to the load divided by the effective neck area

​​The weld regardless of the direction of the load. transverse fillet welds are more durable because they are uniformly loaded along the entire length and the longitudinal fillet welds are unevenly deformed due to various deformations along their entire length. in addition tests show that failure occurs at an angle other than 45 which gives them large effective areas of the throat. figure. 4 show the longitudinal and transverse filled weld. longitudinal and transverse filled weld check the filled weld in the example and design for the example using aisc equation design fillet weld the nominal strength for the weld metal is given by this equation: rn f nw*a we aisc equation j2-3 rn nominal strength of base metal fexx throat t weld length lrfd: 0.75 asd 2.00 f nw the nominal stress if the weld metal ksi a we effective area of the weld in2 nominal stress is given by table 14.1 in the text book. and many expensive information is given about the equation and fillet weld connection in the text book page 501 and 202. examples 1 and 2 determine the calculations used to determine the strength of various fillet welds example 1 a 1/4-in fillet weld smaw process is used to connect the members shown in the accompanying illustration. determine the lrfd design load and the asd allowable load that can be in filled weld connection using the aisc specification and e70 electrodes. a36 is used.