NASCC: THE STEEL CONFERENCE
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1 NASCC: THE STEEL CONFERENCE WELDING SYMBOLS AND PRESENTATION FOR DESIGNERS AND DETAILERS (N72) PRESENTER: ROBERT WHYTE, PE, SE LBYD, INC. BIRMINGHAM, AL
2 HOW TO DESIGN AND DETAIL (CORRECT PRESENTATION) WELD SYMBOLS FOR SHOP AND FIELD ECONOMY AND TO ACCURATELY CONVEY WHAT YOU MEAN.
3 WHY IS IT IMPORTANT TO UNDERSTAND & ACCURATELY SHOW WELD SYMBOLS? ANSWER: BECAUSE THEY TIE THE DESIGN INTENT WITH THE ACTUAL FABRICATION AND MANUFACTURING PROCESS.
4 OUTLINE 1. BASIC WELD TYPES & SYMBOLS. 2. COMMON WELD PROCESSES & POSITIONS. 3. BASIC WELD DESIGN. 4. CORRECT WELD SYMBOLS & PLACEMENT. 5. WELD ECONOMY. 6. SPECIAL TOPICS.
5 BASIC WELD TYPES & SYMBOLS
6 Basic Weld Types & Symbols - BASIC WELD TYPES: Fillet Welds Groove Welds: - Partial Joint Penetration (PJP) - Complete Joint Penetrations (CJP) - Flare-Bevel Groove Weld
7 - FILLET WELDS: Basic Weld Types & Symbols
8 Basic Weld Types & Symbols - BASIC FILLET WELD SYMBOLS:
9 Basic Weld Types & Symbols - BASIC FILLET WELD SYMBOLS: FILLET WELDS
10 Basic Weld Types & Symbols - BASIC GROOVE WELD SYMBOLS: AWS D1.1 => Be Familiar With & Always Show Process for Full or Partial Penetration Welds.
11 Basic Weld Types & Symbols - DEFINITION OF GROOVE : SINGLE-BEVEL GROOVE DOUBLE-BEVEL GROOVE
12 Basic Weld Types & Symbols COMMON GROOVE WELDS IN STRUCTURAL STEEL: - BTC-P4 - TC-U4a - B-U4a, or, B-U4b 95% - BTC-P10
13 Basic Weld Types & Symbols - PARTIAL JOINT PENETRATION WELDS:
14 - BTC-P4: Basic Weld Types & Symbols E = Effective Throat S = Preparation (Bevel) f = Land, 1/8 (Min.)
15 Basic Weld Types & Symbols - BTC-P4 JOINT DESIGNATION:
16 Basic Weld Types & Symbols - BASIC GROOVE WELD SYMBOLS: AWS D1.1 => Be Familiar With & Always Show Process for Full or Partial Penetration Welds.
17 Basic Weld Types & Symbols - SPECIAL TOPIC : Fillet Overlay for PJP:
18 Basic Weld Types & Symbols - SPECIAL TOPIC : Fillet Overlay for PJP:
19 Basic Weld Types & Symbols - BTC-P10: E = Effective Throat E max = 5/8 t For t hss = 3/8 E = (0.93) 5/8 (3/8 ) E = (Design) E = ¼ (Noted)
20 - BTC-P10: Basic Weld Types & Symbols
21 - BTC-P10: Basic Weld Types & Symbols
22 Basic Weld Types & Symbols - BTC-P10 JOINT DESIGNATION:
23 Basic Weld Types & Symbols - BASIC GROOVE WELD SYMBOLS: AWS D1.1 => Be Familiar With & Always Show Process for Full or Partial Penetration Welds.
24 Basic Weld Types & Symbols - BASIC PJP WELD SYMBOLS: PJP WELDS
25 Basic Weld Types & Symbols - FULL PENETRATION WELDS: Strength of Joint = Strength of Lesser Material
26 - TC-U4a: Basic Weld Types & Symbols
27 Basic Weld Types & Symbols - TC-U4a JOINT DESIGNATION:
28 Basic Weld Types & Symbols - BC-U4a: - BC-U4b: b for Back Gouge
29 - Gouging: Basic Weld Types & Symbols
30 Basic Weld Types & Symbols - BASIC CJP WELD SYMBOLS: CJP WELDS
31 COMMON WELD PROCESSES & POSITIONS
32 Common Weld Processes & Positions Commonly Used Arc Welding Processes Are: Shielded Metal Arc Welding (SMAW) Stick Electrode Flux Core Arc Welding (FCAW) Gas Metal Arc Welding (GMAW) Submerged Arc Welding (SAW) The Type of Joint and Weld Position (Flat, Horizontal, Vertical, and Overhead) are Dependent on These Processes.
33 Common Weld Processes & Positions SMAW: (Stick- Electrode)
34 Common Weld Processes & Positions FCAW & GMAW:
35 Common Weld Processes & Positions WELD POSITIONS
36 Common Weld Processes & Positions FROM AISC / AWS D1.1:
37 BASIC WELD DESIGN
38 Fillet Weld in Shear: ASD: 0.3(70)0.7071/16 = Rn/Ω = D L Basic Weld Design LRFD: 0.45(70)0.7071/16 = ΦRn = D L (E70XX Electrodes) E = D
39 Basic Weld Design Must NEVER Put a Single Fillet Weld in Tension
40 - FILLET WELDS: Basic Weld Design Gaps in Fillet Welds are Allowed Up to 3/16
41 Basic Weld Design - LOADING DOUBLE FILLET WELDS: Must Never Load Single Fillet Weld With Moment About Longitudinal Axis More on This Later
42 Basic Weld Design - OVERLAPPING FILLET WELDS: May Lay 3/16 Fillet Weld on 3/16 Thk. Plate.
43 Basic Weld Design - MINIUM SIZE OF FILLET WELDS:
44 Basic Weld Design PJP Weld in Shear: ASD: 21.0 ksi (Strength) Rn/Ω = 21.0 (E) L LRFD: 31.5 ksi (Strength) ΦRn = 31.5 (E) L E = Effective Throat S = Preparation (Bevel) f = Root Face (Land) R = Root Opening
45 AISC 13 th Ed. Manual
46 TWO METHODS: Basic Weld Design - ELASTIC METHOD - INSTANTANEOUS CENTER OF ROTATION, IC, METHOD
47 Elastic Method Properties of Weld Groups If you are using this table you are doing ELASTIC method.
48 Elastic Method - Eccentric Force is Resolved Into a Shear & Moment Acting at the Center of Gravity (CG) of the Bolt Group. - r p : All Weld Elements Share P Equally. - r mx, r my : Proportional to Distance from CG.
49 Instantaneous Center of Rotation (IC Method) Properties of Weld Groups If you are using this table you are doing Instantaneous Center of Rotation method.
50 Instantaneous Center of Rotation (IC Method) - Eccentricity Produces Both a Relative Rotation & Translation - The Combined Effect of This Relative Movement is Equivalent to a Rotation About IC. - Location of IC Depends on Weld Geometry.
51 Basic Weld Design COMPARISON OF TWO METHODS: D = 5/16
52 Basic Weld Design TRANVERSELY LOADED FILLET WELDS:
53 CORRECT WELD SYMBOLS & PLACEMENT
54 Correct Weld Symbols & Placement - ERRONEOUS WELD SYMBOLS:
55 Correct Weld Symbols & Placement - ERRONEOUS WELD SYMBOLS: TIP: PLUS GAP OR INCREASE FOR GAP MEANS THAT THE WELD SIZE MUST BE INCREASED FOR THE AMOUNT OF GAP BETWEEN THE SLOT IN THE HSS AND THE GUSSET PLATE IF GAP IS 1/16 INCREASE 1/4 to 5/16.
56 Correct Weld Symbols & Placement - ERRONEOUS WELD SYMBOLS:
57 Correct Weld Symbols & Placement - ERRONEOUS WELD SYMBOLS:
58 Correct Weld Symbols & Placement - ERRONEOUS WELD SYMBOLS: Overuse of All-Around Weld Symbol:
59 Correct Weld Symbols & Placement - ALL-AROUND WELD SYMBOL:
60 Correct Weld Symbols & Placement - C SHAPED & L SHAPED WELDS:
61 Correct Weld Symbols & Placement - EXTENDED SHEAR PLATE WELDING:
62 Correct Weld Symbols & Placement - SKEWED WELDS:
63 WELD ECONOMY
64 Weld Economy - Fillet Welds are Economical. - 3/16, 1/4, & 5/16 Fillet Welds are One Pass Welds. - 3/8 and Greater Fillet Welds are Multiple Pass Welds.
65 Multi-Pass Welds: Weld Economy
66 Weld Economy Order of Economy: 1. Fillet Welds. 2. Partial-Joint Penetration Welds (PJP). 3. Complete-Joint Penetration Welds (CJP).
67 Weld Economy Maximum Fillet Weld Sizes Before Considering Partial Penetration Welds 5/8 to 3/4 3/4 Fillet Welds Shear Strength = 16.7 k/in. (factored) Area of 3/4 Fillet Weld = sq in Partial Penetration Weld with Strength = 16.7 k/in. (factored) E = 0.53 in. Bevel = 11/16 in. Area of Partial Pen = sq in
68 Weld Economy Two Welds Are Better Than One:
69 Full Penetration Welds: Weld Economy Weld Strength = Strength of Lesser Grade Material Increasing Thickness of Lesser Grade Material Does NOT Increase the Strength of the Welded Joint
70 SPECIAL TOPICS
71 Special Topics Transverse Weld Shrinkage Single Plate with Short Slots DO NOT Pretension Bolts Prior to Welding Beam Flanges. NOT RECOMMENDED: Double Angle Web Connection Angles Restrict Transverse Weld Shrinkage
72 - FIELD FIX: Special Topics
73 Special Topics 1) ADD BRACING TO EXISTING BUILDING:
74 Special Topics 2) DETAIL IS MIRRORED OR FLIPPED FOR UPPER END OF BRACE:
75 Special Topics
76 Special Topics - COLUMN WEB DOUBLER WELDING:
77 THANK YOU!! QUESTIONS?
78 For a copy of the slides from today please Robert at rwhyte@lbyd.com
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