Welding Symbols

Welding Symbols

Welding Symbols Ch. 38 Types of drawings Working drawings drawing of objects used to produce projects/structures in the shop Assembly drawings shows the object to be made as it would appear in a fully assembled, ready to use form. Detail drawings are made of each different part in the

assembly process. The Theory of Orthographic Projection Presenting an object and all of its sides and makeup on a flat piece of paper. Building a Weld Symbol The main foundation of a weld symbol is a reference line with an arrow at one end.

Located above or below the base line is the type of weld to be performed. Reference data is located at the back of the base line, indicating what type of welding process to be used. Ref Data All data is indicated by geometric figures, numerical values, and abbreviations. *The tail may be left off if not reference data is to be

used Location of Field Other Side Weld or Weld All Around Symbol GMAW Arrow Side

The most important factor in a welding symbol is the type of weld, in relationship with the type of joint to be used. There are five main types of joints Butt, Corner, Lap, T, & Edge Welds are classified into fillet, plug, spot, seam, or groove They are broken down further with each weld having its own symbol.

QUIZ The direction of the arrow is not important, it may run up or down. When both sides of the joint are to be welded the symbol appears above and below the line. Combining Weld Symbols Some joints may require more than one type of weld on a particular joint.

Size of fillet welds The width of a fillet weld is shown to the left of the weld symbol and is expressed in fractions, decimals, or metric units. 3/8 3/8 10

10 The length of the weld is shown to the right of the weld symbol. When both sides are to be welded the same both are shown. When a fillet weld with unequal legs is required, the size of the legs is placed in parentheses.

(1/4x1/2) The length & pitch increments of intermittent welds are shown to the right of the weld symbol. The first figure represents the length of the weld section and the second figure the pitch (center-to-center spacing) 3/8 6 - 10 Length

Pitch Size of groove welds There are several types of groove welds. Their sizes (effective throat in fractions, decimals or millimeters) are shown here. For a single-groove and symmetrical double-groove welds which extend completely through the metal being joined, no size is included on the weld symbol.

For groove welds which extend only partly through members being joined or on nonsymmetrical double-groove joints, weld size (effective throat) is shown in parentheses to the left of the weld symbol. .38mm EFFECTIVE THROAT (.38)

A dimension not in parentheses when placed to the left of the weld symbol indicates the depth of the bevel only. When both the effective throat and bevel depth are indicated, the groove bevel depth is located to the left of the effective throat size. .25 (.38) .25

Groove Depth .38 Effective Throat Root opening of groove joints is shown inside the weld symbol. The included angle of the bevel is placed below or above the weld symbol. 1/16

1/16 60 60 The size of flare-groove welds is considered as extending only to the tangent points as indicated by dimensional lines. The size of flange welds is shown by the radius and height of the

flange and is separated by a plus mark placed to the left of the weld symbol. The size of plug welds is shown to the left of the weld symbol, the depth, when less than full, on the inside of the weld symbol, the center-to-center spacing (pitch) to the right of the weld symbol, and the included angle of countersink below the symbol. Slot welds length, width, spacing angle of countersink and location

of slot welds are not shown on the symbol. This data is included by showing a special detail on the print. If the slots are partly filled, the depth of filling is shown inside. Size of spot welds Spot welds are dimensioned either by size or strength. Size is designated as the diameter of the weld. Size of seam welds

Seam welds are dimensioned either by size or strength. The length of the seam weld is placed to the right of the weld symbol. The pitch of intermittent seam welds is shown to the right of the length dimension. Weld-all around symbol When a weld is to extend completely around a joint, a small circle is placed where the arrow connects the reference line.

Field weld symbol Welds to be made in the field are shown by a darkened triangular flag at the juncture of the reference line and arrow. The flag always points toward the tail of the arrow. Field welds are welds not to be performed in the shop or at the place of initial construction.

Reference Tail The tail is included only when some definite welding specifications, procedure, weld or cutting process needs to be called out. Examples: AC/DC welding, SMAW, & GMAW etc. Back or Backing Welds Refers to the weld made on the opposite side of the regular weld. Back welds are occasionally specified to

insure adequate penetration and provide additional strength to a joint. This particular symbol is included opposite the weld symbol. No dimensions of back or backing welds except height of reinforcement is shown on the weld symbol. Melt-thru welds When complete joint penetration of the weld through the material is required in welds made from one side only, a

special melt-thru weld symbol is placed opposite the regular weld symbol. No dimension of melt-thru, except height of reinforcement, is shown on the symbol. Surfacing welds Welds whose surfaces must be built up by a single or multiple passes welding are provided with a surfacing weld symbol. The height of the built-up surface is indicated by a dimension placed to the left of the

surfacing symbol. Chapter Review 1. Indicate the meaning of the following symbols. 1.

2. A = fillet both sides, B= fillet arrow side weld all around, C= fillet other side What type of weld do these symbols indicate? 2. A = seam, B = plug, C = fillet, D = v-groove

3. How would you interpret these symbols? 3. 4.

A = the size of the bead is , fillet weld on the arrow side, B = fillet weld 3 long or length of the bead, C = plug or slot weld depth. These symbols represent what weld specifications? 4. A = .25 size in diameter spot weld arrow side, B = V-groove arrow side, C = u-groove other side

5. What do welds designated with the following symbols represent? 5. 6.

A = v- groove arrow side 3/8 size of bevel depth is effective throat size, B = square joint arrow side & an edge flange joint on the other side, C = square groove with 1/16 gap in the metal What is the meaning of each of these symbols? 6. A = v-groove arrow side & 1/8 root opening v-groove other side, B = fillet

arrow side is the size of the bead with the length of 6. 7. What do these symbols represent? 7. 8.

A = seam weld other side width of the weld bead is 1 & the length of the weld is 3, B = arrow side & other side EXTRA CREDIT!!!! & FW is flash welding What do these symbols mean? 8.

A = backing arrow side & v-groove other side, B = fillet arrow side 5/16 size or width & 4 long; other side fillet width & 6 long, C = bevel groove arrow side & other side with 35 angle.

Recently Viewed Presentations

  • Iterating: structure to regression

    Iterating: structure to regression

    Fits a latent class linear mixed model (LCLMM) also known as growth mixture model or heterogeneous linear mixed model. LCLMM consists in assuming that the population is divided in a finite number of latent classes; each latent class is characterized...
  • Aztecs Welcome to the Aztecs

    Aztecs Welcome to the Aztecs

    Mexico city stands where the great Aztec city once lay. The gold is underneath Mexico city which is currently the largest city in the world. The Aztec symbol is proudly flown on the Mexican flag and today the Mexican people...
  • 15-213 Section F Spring 06 - Carnegie Mellon School of ...

    15-213 Section F Spring 06 - Carnegie Mellon School of ...

    Arial Symbol Default Design Paint Shop Pro Image Recitation #2 15-213 Section F Spring 2006 Jernej Barbic Little Endian to Big Endian Little Endian to Big Endian If-then-else If-then-else If-then-else 2's complement: general rule 2's complement: some examples Floating point...
  • LITERACY Numerator Denominator Mixed number LCM RESEARCH How

    LITERACY Numerator Denominator Mixed number LCM RESEARCH How

    How many miles did she walk in total? 2) Hannah is baking two cakes. One cake requires 113cups of milk. Hannah currently has 114cups of milk. How much more milk does Hannah need? ... Joanne Morgan ...
  • Investor Presentation Noble Capital Markets 13th Annual Investor

    Investor Presentation Noble Capital Markets 13th Annual Investor

    Tangible book value at 9/30/2016 of $3.23 per share (does not include the value of approximately $1.49 per share for the potential deferred tax asset from our operating loss carryforwards and temporary differences that could offset future taxable income).
  • MANNERS OF DEATH - Kinzie Martin

    MANNERS OF DEATH - Kinzie Martin

    MANNERS OF DEATH. By: KINZIE MARTIN. ACCIDENTAL 40%. Accidental death are the most common types of death. There are a major group of things that can be considered an "Accidental" death. AN accidental death must be avoidable and unintentional. ......
  • Introduction - Thrombosis Canada - Thrombose Canada

    Introduction - Thrombosis Canada - Thrombose Canada

    sur la Thrombose du Canada. www.tigc.org. B. The CCS antiplatelet committee was composed of national physicians, with specialties in interventional cardiology, general cardiology, thrombosis, internal medicine, primary care, CV surgery, peripheral vascular surgery, neurology, endocrinology ...
  • Writing For Radio.

    Writing For Radio.

    Heightened dialogue vs naturalistic dialogue. Heightened language is the language of the theatre...high octane communication...poetic, philosophical...charged..the expression of the playwright...It serves not only the development of the plot and character, but it also presents the view of the writer. Works...