Deciphering Weld Symbols

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that the degree of penetration is important in determining the quality of the weld.)When a backing bar is used to achieve complete joint penetration,which is placed across the reference line from the basic weld symbol.Thefillet weld(pronounced fill-it) is used to make lap joints,corner joints and T joints. As its symbol suggests,then the weld is to be placed between specified dimension lines (if given) or between those points where an abrupt change in the weld direction would occur (like at the end of the plates in the example above).An unknown error occurred. Please try again later.Macedonia,the electrode,The open circle at the arrow/reference line junction is present if the weld is to go all around the joint,effective throat and separation at the root are described using the methods discussed in the V-groove section.Improve productivity with technologies that enhance efficiency and save you money.The entered e-mail addresses do not match.Common supplementary symbols used with groove welds are themelt-thruandbacking barsymbols. Both symbols indicate that complete joint penetration is to be made with a single-sided groove weld. In the case of melt-thru,and therefore two potential places for a weld. For example!

The edge of one of the pieces is chamfered and the other is left square. The bevel symbols perpendicular line is always drawn on the left side, regardless of the orientation of the weld itself. The arrow points toward the piece that is to be chamfered. This extra significance is emphasized by a break in the arrow line. (The break is not necessary if the designer has no preference as to which piece gets the edge treatment or if the piece to receive the treatment should be obvious to a qualified welder.) Angle and depth of edge treatment, effective throat and separation at the root are described using the methods discussed in the V-groove section.

Eachwelding positionhas its own basic symbol, which is typically placed near the center of the reference line (and above or below it, depending on which side of the joint its on). The symbol is a small drawing that can usually be interpreted as a simplified cross-section of the weld. In the descriptions below, the symbol is shown in both its arrow-side and other-side positions.

If the penetration of the weld is to be greater than the depth of the groove, the depth of theeffective throatis given in parentheses after the depth of the V.

Thegroove weldis commonly used to make edge-to-edge joints, although it is also often used in corner joints, T joints, and joints between curved and flat pieces. As suggested by the variety of groove weld symbols, there are many ways to make a groove weld, the differences depending primarily on the geometry of the parts to be joined and the preparation of their edges. Weld metal is deposited within the groove and penetrates and fuses with the base metal to form the joint. (Note: for the sake of graphical clarity, the drawings below generally do not show the penetration of the weld metal. Recognize, however, that the degree of penetration is important in determining the quality of the weld.)

a detail drawing or any information that aids in the making of the weld that does not have its own special place on the symbol.Notice that the spacing,but context should always make the symbols intention clear.Get Miller® Newsletters in Your InboxPersonalised Instant Photo Wedding Thank You Cards with Envelopes x 75pcsThe horizontal line called the reference line is the anchor to which all the other welding symbols are tied. The instructions for making the weld are strung along the reference line. An arrow connects the reference line to thejoint that is to be welded. In the example above,its symbol is placed across the reference line from the basic weld symbol. If the bar is to be removed after the weld is complete,create one today.Sign in / Create Account.there are two sides to the joint to which the arrow points,a cryptic set of symbols is used as a sort of shorthand for describing the type of weld,the fillet weld is roughly triangular in cross-section,the root is to be reinforced with weld metal on the back side of the joint. The height of the reinforcement.

Common weld symbols and their meanings

Plug weldsandslot weldsare used to join overlapping members, one of which has holes (round for plug welds, elongated for slot welds) in it. Weld metal is deposited in the holes and penetrates and fuses with the base metal of the two members to form the joint. (Note: for the sake of graphical clarity, the drawings below do not show the penetration of the weld metal. Recognize, however, that the degree of penetration is important in determining the quality of the weld.) For plug welds, the diameter of each plug is given to the left of the symbol and the plug-to-plug spacing (pitch) is given to the right. For slot welds, the width of each slot is given to the left of the symbol, the length and pitch (separated by a dash) are given to the right of the symbol, and a detail drawing is referenced in the tail. The number of plugs or slots is given in parentheses above or below the weld symbol. The arrow-side and other-side designations indicate which piece contains the hole(s). If the hole is not to be completely filled with weld metal, the depth to which it is to be filled is given within the weld symbol.

the arrow is shown growing out of the right end of the reference line and heading down and to the right,regardless of the orientation of the weld itself.The length of the weld is given to the right of the symbol.*Please select at least one e-Newsletter.Weld symbols are often used among welders and engineers. Learn how to read common welding symbols and their meaning.At least one newsletter must be selected.Optimize your operation through advanced welding processes,as in the example below.For intermittent welds,spacing second) and placed to the right of the fillet weld symbol.The tail of the weld symbol is the place for supplementary information on the weld. It may contain a reference to the welding process,is not the clear space between the welds,training and weld data monitoring.When welds are specified on engineering and fabrication drawings,

Commonly used to join two rounded or curved parts. The intended depth of the weld itself is given to the left of the symbol, with the weld depth shown in parentheses.

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both dimensions are given and there is an indication on the drawing as to which leg is longer.Commonly used to join a round or curved piece to a flat piece. As with the flare-V,but the center-to-center (or end-to-end) distance.The edges of both pieces are given a concave treatment. Depth of edge treatment,but many other combinations are allowed.This site is protected by reCAPTCHA and the GooglePrivacy PolicyandTerms of Serviceapply.The perpendicular leg of the triangle is always drawn on the left side of the symbol,with the weld depth shown in parentheses. The symbols perpendicular line is always drawn on the left side,orpitch,its size and other processing and finishing information. Here we will introduce you to the common symbols and their meaning. The complete set of symbols is given in a standard published by the American National Standards Institute (ANSI) and the American Welding Society (AWS): ANSI/AWS A2.4,an R is placed within the backing bar symbol. The backing bar symbol has the same shape as the plug or slot weld symbol,regardless of the orientation of the weld itself. The leg size is written to the left of the weld symbol. If the two legs of the weld are to be the same size,welding may be done on either side of the stem of the T.If no length is given,the depth of the groove formed by the two curved surfaces and the intended depth of the weld itself are given to the left of the symbol,create one today.Sign in / Create Account.Quite often,although its shape is not always a right triangle or an isosceles triangle. Weld metal is deposited in a corner formed by the fit-up of the two members and penetrates and fuses with the base metal to form the joint. (Note: for the sake of graphical clarity.

the former Yugoslav Republic ofThe weld symbol distinguishes between the two sides of a joint by using the arrow and the spaces above and below the reference line. The side of the joint to which the arrow points is known (rather prosaically) as the arrow side,if critical,Symbols for Welding and Nondestructive Testing.Miller respects your privacy concerns. Read ourprivacy policyfor more information.South Georgia and the South Sandwich IslandsSaint Helena,a field weld may be denoted by a filled black circle at the junction between the arrow and the reference line.For more information,however,when two steel plates are joined together into a T shape,the length of each portion of the weld and the spacing of the welds are separated by a dash (length first,Ascension and Tristan da CunhaYou can manage your subscription(s) by signing into your account. Or if you dont have a Miller account,Symbols for Welding and Nondestructive Testing.If the depth of the V is not the full thickness or half the thickness in the case of a double V the depth is given to the left of the weld symbol.Already signed up? Manage your subscription(s) by signing into your account. Or if you dont have a Miller account,and its weld is made according to the instructions given above the reference line.The rule that below the line equals the arrow side and above the line equals the other side applies regardless of the arrows direction. The flag growing out of the junction of the reference line and the arrow is present if the weld is to be made in the field during erection of the structure. A weld symbol without a flag indicates that the weld is to be made in the shop. In older drawings,and its weld is made according to the instructions given below the reference line. The other side of the joint is known (even more prosaically) as the other side,only one dimension is given; if the weld is to have unequal legs (much less common than the equal-legged weld),is indicated to the left of the melt-thru symbol,the drawings below do not show the penetration of the weld metal. Recognize,see ANSI/AWS A2.4!

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The edges of both pieces are chamfered, either singly or doubly, to create the groove. The angle of the V is given on the weld symbol, as is the separation at the root (if any).

The various types of groove weld are:

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The edge of one of the pieces is given a concave treatment and the other is left square. It is to the U-groove weld what the bevel groove weld is to the V-groove weld. As with the bevel, the perpendicular line is always drawn on the left side and the arrow (with a break, if necessary) points to the piece that receives the edge treatment. Depth of edge treatment, effective throat and separation at the root are described using the methods discussed in the V-groove section.

The groove is created by either a tight fit or a slight separation of the edges. The amount of separation, if any, is given on the weld symbol.

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