Houldcroft Which Process?

A Guide to the Selection of Welding and Related Processes
1. Auflage 1990
ISBN: 978-1-84569-895-9
Verlag: Elsevier Science & Techn.
Format: EPUB
Kopierschutz: 6 - ePub Watermark

E-Book, Englisch, 96 Seiten

Reihe: Woodhead Publishing Series in Welding and Other Joining Technologies

The author presents a unique scheme for selecting processes at the drawing board stage where a need for a connection is usually first perceived. Leading the enquirer through a series of diagrams and tables, he reveals the processes which are feasible for a particular joint. The book includes descriptions of 28 joining processes in which the principal method of use, advantages and limitations, application and factors affecting costs are explained. The book is well illustrated and contains much useful advice invaluable to practising engineers and designers having no previous knowledge of joining.

Autoren/Hrsg.

Houldcroft, P T

Leseproben

List A

Basic joint types

Publisher Summary

This chapter presents a list of basic joint types. When work can be rotated, mechanized processes are the best. Small sizes can be joined by a nugget of weld, braze metal or adhesive but it would be larger than the diameter of work. Plug and slot welds can be made by MMA, TIG, and MIG. Overlap joints can be made without filler by oxyacetylene, TIG, and plasma in the thicknesses and in any thickness by power beam. Incomplete overlap is used when the process deposits filler metal, such as MMA and MIG. Folded and interlocked corners in the sheet are completed by brazing, soldering, or adhesive bonding. Joints that are made by brazing, soldering, or adhesive bonding in thin section are lumpy and the trimming weakens. Full penetration welds can be safely trimmed. With heavy joints, the plate must be sound to avoid lamellar tears. Friction welding is not usually possible if the set on the member is a section. Flash welding requires upstand on the plate or base part.

01. Butt, square edge, Sheet, plate and longitudinal in tube, single or double-sided.

0

thickness, mm

< 1

1

1–4

2

4–16

3

16–64

4

> 64

02. Butt, grooved. Sheet, plate and longitudinal in tube or pipe, single or double-sided.

0

thickness, mm

< 1

1

1–4

2

4–16

3

16–64

4

> 64

03. Butt in wire, rod or bar.

0

diameter, mm

< 1*

1

1–4

2

4–16

3

16–64

4

> 64

*Small sizes can be joined by a nugget of weld, braze metal or adhesive but this will be larger than diameter of work

04. Butt, circumferential. Tube up to 100 mm O/D.

0

diameter, mm

< 2*

1

2–8

2

> 8

3

non-rotatable, mm

2–8#

4

> 8

*When work can be rotated mechanised processes are best

#Also hollow sections

05. Butt, circumferential. Pipe> 100 mm O/D.

0

rotatable, mm

< 2 *

1

2–8

2

> 8

3 non-rotatable, mm

< 8

4

> 8

*When work can be rotated mechanised processes are best

06. Butt in section.

0

thickness, mm

<1

1

1–4

2

4–16

3

16–64

4

> 64

07. Lap in sheet and plate.*

0

thickness, mm

< 1

1

1–4

2

4–16

3

16–64

4

> 64

08. Lap, wire or rod to sheet or plate.

0

thickness, mm

< 1 equal*

1

1–4 equal

2

> 4 equal

3

1–4 plate #

4

cross wire

*Equal means wire diameter and other member similar thickness.

#Plate means wire to thicker member. These joints are poor in fatigue

09. Corner in sheet or plate.

0

thickness, mm

< 1*

1

1–4*

2

4–16

3

16–64

4

> 64

*Overlap joints can be made without filler by oxyacetylene, TIG and plasma in these thicknesses and in any thickness by power beam. Incomplete overlap used when process deposits filler metal, e.g. MMA and MIG. Folded and interlocked corners in sheet completed by brazing, soldering or adhesive bonding

10. Corner, flanged.

0

thickness, mm

< 1*

1

1–4

2

4–16

3

16–64

4

> 64

*Poor fit-up gives ragged fusion welds. Joint B unsuitable for welding by resistance seam, resistance spot or power beam

11. Corner, frame in bar, mitre or square.

0

thickness, mm

< 1*

1

1–4*

2

4–16#

3

16–64#

4

> 64#

*Weld may be lumpy and require trimming

#Fusion welding will require edge preparation

12. Corner, frame in tube or hollow section

0

thickness, mm

< 1

1

1–4

2

4–16

3

16–64

4

> 64

13. Corner, frame in section, mitre or square

0

thickness, mm

< 1*

1

1–4

2

4–16

3

16–64

4

> 64

*Joints made by brazing, soldering or adhesive bonding in thin section will be lumpy and trimming will weaken. Full penetration welds can be safely trimmed

14. T in sheet or plate, fillet.*

0

thickness, mm

< 1

1

1–4

2

4–16

3

16–64

4

> 64

15. T in sheet or plate, full penetration.*

0

thickness, mm

< 1#

1

1–4

2

4–16

3

16–64

4

> 64

#Thicknesses of members approximately equal. See joint 44 for dissimilar thicknesses

16. T in...