1 Blueprint Reading for the Machine Trades, Sixth Edition Unit 16: Weldments Russ Schultz and Larry...

1

Blueprint Reading for the Machine Trades, Sixth Edition

Unit 16: Weldments

Russ Schultz and Larry Smith

PowerPoint presentation created by LaVonne Vichlach

Schultz and Smith: Blueprint Reading for the Machine Trades, 6th edition

© 2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.2

Weldments Created from individual pieces of metal

that have been welded together Almost all metals can be welded-some

are easier to work with Low-carbon can be welded easier than

high-carbon Thin and very thick material require

special considerations Weld drawings have weld symbols



Types of Joints



Types of Welds Four basic types of gas and arc welds

Fillet Groove-named for shape-V(both pieces are

beveled), J or U (both pieces J-grooved) Plug or slot-used when fastening one piece

on top of another-eliminate fasteners Back or backing weld-surface of joints when

of groove is used



Types of Welds



Welding Symbols Graphical symbols have been

established for use on weldments Symbols are part of ANSI?AWS

A2.4-98 sponsored by American Welding Society



Reference Line Reference line forms body of

welding symbol All other elements are placed in

designated positions with respect to this line

Arrow is affixed to one end and a tail, when required, is affixed to the other end



Reference Line



Arrow Connects the reference line to one side

of the weld joint Side touched by arrowhead becomes

known as the arrow side Opposite side is the other side of the

joint Bevel and J-groove symbols may include

double bend in arrow Arrow is pointing to the member that is

to receive the groove



Basic Weld Symbols Symbols designate the type of weld to

be performed Position on the reference line is

approximate center-above or below or on both sides of the line



Basic Weld Symbols Symbols below the line designate the

weld to be on the arrow side of the joint Symbols above the line designate the

other side of the joint Symbols on both sides of line indicates

weld on both sides of the joint



Basic Weld Symbols



Standard Location of Elements



Supplementary Symbols Convey additional information

relative to the extent of the welding

Where the welding is performed and the contour of the weld

“Weld all around” and “field weld” symbols appear at the end of the reference line-at junction of arrow



Supplementary Symbols Melt–thru symbol is used where

100% joint or member penetration plus reinforcement is required

Contour symbol is placed above or below the weld symbol

Finish symbol is placed above or below the contour symbol



Supplementary Symbols C = chipping G = grinding M = machining R = rolling H = hammering



Supplementary Symbols



Dimension Size of weld appears to the left of the basic

weld symbol Length of weld appears to the right of the

symbol Length followed by dash designates the

center-to-center spacing of intermittent welds

Angles of grooves and included angles of countersinks for plug weld appears above or below symbol



Tail Appears on the end of the reference line,

opposite the arrow end-whenever a specification, process, or other reference is made in welding symbol

Tail is omitted when no specification, process or references are needed

Specified welding processes will appear in tail of welding symbol as letters

Standard letter designations in chart form



Welding Symbol Quiz 1

List the weld name, joint side, and other supplementary information for the symbol to the right.

1.

Fillet weld, arrow side





Square groove weld, both sides of the joint

2.





Bevel groove weld, opposite side and melt through

3.





V-groove weld, both sides & machine flush contour

4.





.50 fillet weld, arrow side, field weld

5.





Fillet weld, all around joint, torch brazing

6.





Plug or slot weld, arrow side, 1” Dia, 30° Angle, 4” pitch

7.





Bevel groove & fillet weld, arrow side, fillet weld opposite side, 2” LG, 5” Pitch

8.





U-groove & fillet weld, arrow side w/convex contour

& back or backing weld opposite side

9.





J-groove weld opposite side (groove is in right or bottom PC)

& back or backing weld arrow side w/flush contour

10.



For the letter “A.” Fillet weld both sides.

Draw the symbol for the letter identified below.

Welding Symbol Exercise



For the letter “B.” Fillet weld all around.





For the letter “C.” V-groove weld arrow side, grind flush. Fillet weld opposite side.





For the letter “D.” J-groove weld both sides, then fillet weld both sides





Resistance Welds Spot Projection Seam Flash Upset welds



Spot Welding Used for fusing two or more sheets

of metal together Applying pressure by means of

electrodes Pass high current at low voltage

through sheets from one electrode to another



Projection Welding Projections are embossed into one

of the pieces Larger electrodes are used that

accommodate several welds simultaneously



Seam Welding An adaptation of spot welding Uses continuously rotating rollers

for electrodes Rollers create a series of

overlapping spots as electrodes are automatically turned on and off as they revolve



Flash or Upset Welding Used to join the ends of bars, rods,

strips, tubing, etc. Clamp tow pieces together in

fixtures facing each other Bring ends together and hold them

together them under pressure until fusion takes place



Resistance Welding Symbols

Spot, seam, flash, and upset weld symbols do not normally have arrow-side or other-side significance-so they are centered on reference line

Projection weld abbreviated RPW Designate either arrow-side to indicate

which piece receives the projection Standard letter designation for process

is included in the tail



Resistance Welding




1.

Resistance projection weld (opposite side receives projection)




2.

Flash weld




3.

Resistance seam weld, .25 size




4.

Resistance spot weld, 700 LB. strength




5.

Resistance projection weld, arrow side, 500 LB. Strength, 2.00 pitch, Qty 3




6.

Resistance spot weld, .50 size, 6.00 pitch




7.

Resistance seam weld, 1000 LB. Strength, 5” Lg., 10” pitch




8.

Upset weld, grind convex contour, both sides




9.

Resistance spot weld, .25 size, 3” pitch, Qty 4




10.

Resistance projection weld, opposite side, 3/8 size, 4” pitch, Qty 6




1. Weld all around




2. Field weld




3. Back or backing weld




4. Melt-thru




5. Weld other side only




6. V-groove weld




7. J-groove weld




8. Bevel groove weld




9. Plug or slot weld




10. Resistance spot weld




11. Surfacing




12. Flare-V weld




13. Upset weld




14. Flush contour




15. Resistance seam weld




16. Flare-bevel weld




17. Concave contour




18. Root opening




19. Square groove weld




20. Edge-flange weld



1. Describe the complete specifications from the welding symbol located at “A.”

Bevel groove weld .25 DP, then fillet weld .25 x .50, all around joint

FLG TUBE WELDMENT



Bevel groove weld, flush contour, both sides of joint

2. Describe the complete specifications from the welding symbol located at “B.”

FLG TUBE WELDMENT



J-groove weld, then fillet weld, both sides of joint

3. Describe the complete specifications from the welding symbol located at “C.”

FLG TUBE WELDMENT



J-groove weld, arrow side, machine flush. Back or backing weld opposite side. (Groove is in .750 x 1.75 PC

4. Describe the complete specifications from the welding symbol located at “D.”

FLG TUBE WELDMENT



Field weld, .50 fillet, concave contour, all around joint

5. Describe the complete specifications from the welding symbol located at “E.”

FLG TUBE WELDMENT



6. What is the MMC of diameter F ?

3.02

FLG TUBE WELDMENT



7. What is the MMC of diameter G ?

2.48

FLG TUBE WELDMENT



8. What is the MMC of diameter H ?

1.999

FLG TUBE WELDMENT



9. What is the maximum overall height dimension I ? 12.025

FLG TUBE WELDMENT



10. What is the maximum overall width dimension J ? 6.53

FLG TUBE WELDMENT



11. How many individual pieces are required to make one complete weldment?

5

FLG TUBE WELDMENT



12. What size is the locational tolerance zone if the three reamed holes measure exactly .500?

.022

FLG TUBE WELDMENT



13. What size is the locational tolerance zone if the three counterbored holes measure exactly .375?

.016

FLG TUBE WELDMENT



14. What is the geometric tolerance on datum A if the base thickness measures exactly .748?

.002

FLG TUBE WELDMENT



15. Calculate the minimum possible material between the side of a reamed hole and the flange OD. (Consider the geometric tolerance.)

.479

FLG TUBE WELDMENT

1 Blueprint Reading for the Machine Trades, Sixth Edition Unit 16: Weldments Russ Schultz and Larry...

Documents

Transcript of 1 Blueprint Reading for the Machine Trades, Sixth Edition Unit 16: Weldments Russ Schultz and Larry...