FIGURE 5-1 Types of joints. Cengage Learning Welding Joint Design & Welding Symbols Chapter #5

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4 FIGURE 5-1 Types of joints. Cengage Learning 2012 Welding Joint Design & Welding Symbols Chapter #5

5 Open Corner Closed Corner FIGURE 5-2 Two ways of fitting up an outside corner joint. Cengage Learning 2012 FIGURE 5-3 Edge joints. Cengage Learning 2012 Welding Joint Design & Welding Symbols Chapter #5

6 Name three types of joints that use fillet welds? NOTE: "fillet weld" = a triangular shaped weld in a corner Welding Joint Design & Welding Symbols Chapter #5

7 How is the size of a fillet determined? NOTE: While Leg Size is the usual method to specify and measure weld size, the Effective Throat is a more accurate measure of fillet weld strength! Actual Throat Effective Throat Convexity Leg Size 2 ¼ Leg Size 1 Theoretical Throat Welding Joint Design & Welding Symbols Chapter #5

8 Side Note: some considerations in selecting a type of joint to use on a fabrication. Accessibility for welding Strength requirements Cyclic or static loading Material thickness Welding process to be used Material type Code Requirements Cost Welding Joint Design & Welding Symbols Chapter #5

9 Name two edge preparations used with butt joints. Bevel Groove Vee Groove J Groove Square Groove U Groove Welding Joint Design & Welding Symbols Chapter #5

10 Edge preparations used with butt joints. Welding Joint Design & Welding Symbols Chapter #5

11 Single V Groove Double V Groove Welding Joint Design & Welding Symbols Chapter #5

12 Cost A number of items affect weld cost FIGURE 5-14 Even a slight change in groove angle can save time and money. Cengage Learning 2012 Welding Joint Design & Welding Symbols Chapter #5

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14 Welding Symbols (cont d.) 3 parts of the welding symbol body: Arrow Reference Line Tail Welding Joint Design & Welding Symbols Chapter #5

15 Welds on drawings ČSN EN ISO 2553 A Z n x L Z (e) T A - size Z weld sign n number of welds L - length e distance Z intermittent weld T technology information

16 a7 10 x 300 (200) a z z = a. 2 a = 0,5-0,7t Kde: t= BM thickness Circumferential weld Field weld

17 a7 10 x 300 (200) 111 ČSN EN C (ČSN 5817) PC (ČSN EN ISO 6947) OK UPPER VIEW Intermittent weld Opposing weld

18 Elementary welding symbols

19 Elementary welding symbols

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21 Dual Ref.Line To be welded on the arrow side To be welded on the other side

22 Examples:

23 Combination of elementary symbols

24 Combination of elementary symbols

25 Dimensioning the weld

26 Dimensioning

27 Welding positions ČSN EN ISO 6947 Angled axis PA Top edge PF CIRCLE PC PG L=45 Top edge PE L=60

28 Types of Welded structure FRAMES -Civil engineering structures - Buildings, bridges Mechanical engineering-frames, coverings, shafts Energy generation and transfer PRESSURE VESSELS (shells) Processing industry, Tubular frames-sea platforms

29 On following figures answer Material Function of welds Static, dynamic loaded structure Loading conditions Fully loaded welds? Working environment Precision of the part - Distortion, inner tension Productivity, Costs On site, jobshop welding

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33 On following figures answer Material Function of welds Static, dynamic loaded structure Loading conditions Fully loaded welds? Working environment Precision of the part - Distortion, inner tension Productivity, Costs On site, jobshop welding

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37 On following figures answer Material Function of welds Static, dynamic loaded structure Loading conditions Fully loaded welds? Working environment Precision of the part - Distortion, inner tension Productivity, Costs On site, jobshop welding

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41 To consider for design of Welded structure Function of welds - Static, dynamic loaded structure Loading conditions Working environment Precision of the part Productivity, Costs Accessibility for welding-on site, jobshop welding Welding process to be used Material type Code Requirements Cost

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43 Good force transfer High load capacity Dynamic loading full penetration weld Difficult edge preparation

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45 Load carrying in bending Easy execution a increase difficult Risk of weld quench

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47 For thin sheets Good smooth look Easy assembly

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49 Simple rules for design of Welded structure No weld is best Smaller better than big Humidity = Enemy Think how the stress pass through structure