There are several lypes of welded bult splices, some dirccl and otbtrn indim:t which use angles, plres or sleeves. The direct splices a,c illu<1n11cd in Fig. I I 36 and require special cutting or sawing oftbe bar ends. Direel butt joiol T_ypc:s (I) and (2) ore nonnally used in horizonial position and lypes (3) and (4) in vtrlical position. The double-bevel gmo,e weld (lype4) is commonly 11sed for coilann v,:rtical ba,s, An indirect butt splice with splice plate or angle is also shown in Fig. I 1-36. Thc ACI Building Code requir,s thal all,..,ldingshouldconfonnll:JAWS 01. 4, '"Sctu Ctural Wdding Codl.---Reinforc~eel:' of the American Welding ~ ciety. The Welding Code, in tum, rcqutrcs the Contractor to prepare a wrinen welding proccdw-e,pec Jftcotion (WPS) fcr thc welded spliccs. lnformotion on the s-pccific n:quiremenl of a WPS is described in Ora pier 6 and Annex A of Ute Welding Code. Ficrd we Cling o er sin rc. mforcmg bars "lac. :k" ¥-d Jin. Go ··~t" welding) sbouldoc avoided. Simply star<ing a spa. 1' against a bar, "taclci Qg" gn a cglumn !k. Qr !Jiruikagc temperature bar or an_y ~mila, oner(itioo tbat c;Qo~ illc-.,:,;_. higb hea1 a1 one pom? o II b,. 1r crc3lts whal !..'i c:il16d a ··notc N' effcc:~ IC1,1~ h..,c $hown th. at this c-. an n;::d U(. ~ the strength of a bar to 35 or 40 perce.,t of it~ o.-i£,t nal capacity. The cbcmie11I properties or reinforcing bats, except for low-elloy tccl bu, (ASTM A706), can vary considerably. To produce good welds it is o¢e¢>..sary; (a) to have mill le,Creports on the bars, including the chemical propei. tie>,. {b) proper sclcctmn ofelec<rocles ha'i(,·d on ti~ rep. Q,~_(,c J_qy__alificd v~lde. G...-aod (d) careful a<lhcrona: <o weldm_g pioctdurc spc:t. ificauonsi In precast concrete c. ons1ruc:1ion, welded splices are almost a!,vays nece:ssa,yl l'ro COSI concteto membo,s are usually cast wilh projecting bars or plates ll1d lhese projections are CQnneaed from member lo member by butt-welded or lap-wcldcd splices. Placing Rmlorcing 811'1-100, Edtlon 11-33 Section 609 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 6-9