Weld Throat

Weld Measuring Fillets from G.A.L. Gage Company, like our Weld Measuring Keys and Weld Measuring Gaps, are the perfect solution for the repeated checking of particular weld sizes. Weld Measuring Fillets make genuine time-savers that you will find indispensable .. and wonder how you ever worked without them.

• Weld Throat Depth
• Theoretical Throat Of Fillet Weld
• Weld Throat Depth
• Weld Throat Size
• Weld Throat Definition
• Weld Throat Gauge
• Weld Throat Images

The effective area of a weld is calculated by multiplying the length of the weld times the throat of the weld. For design purposes we use the theoretical throat as shown below. In the above diagram, is the fillet weld leg size. The theoretical throat is calculated. FILLET SIZE CONVERTER A simple calculator that converts between throat thickness and leg length. It assumes a symmetrical, mitre, fillet. Input in inches and it'll output in inches.

Weld Measuring Fillets are sturdy, well-made, and come in various handy sizes.

Our Weld Measuring Fillets will surely provide you with many years of service whether in the shop or in the field.

The throat of a fillet weld, which is used in calculating its strength, is defined as the distance between the root and face of the weld. The leg of a fillet weld is used to specify its size in the weld symbol.

Measurements start at .050' to .200'
Measures Leg & Throat

$117.00
Please allow 4-6 days for delivery.

Quickly & easily check your welds for proper profile.

Only 3.5' long by 1.5' wide when collapsed.

• Easy to use. • Fits in pocket! • All Stainless Steel.

$47.00
Please allow 4-6 days for delivery.

Appearance of carrying case may vary

Weld Throat Depth

Check Fillet Leg & Throat Size, Available in Inch or Metric

1/8' to 1'

$36.50
Please allow 4-6 days for delivery.

Appearance of carrying case may vary

Check Fillet Leg & Throat Size, Available in Inch or Metric

1/8' to 1'

$50.50
Please allow 4-6 days for delivery.

Check Fillet Leg & Throat Size

Increments: 1/32' to 1/2', 1/16' to 1'

$85.00
Please allow 4-6 days for delivery.

Theoretical Throat Of Fillet Weld

Check Fillet Leg & Throat Size

1 1/8' to 2' in 1/8' increments

$68.50
Please allow 4-6 days for delivery.

Check Fillet Leg & Throat Size

2 1/8' to 3' in 1/8' increments

$73.50
Please allow 4-6 days for delivery.

Appearance of carrying case may vary

Precision made from stainless steel. All markings and dimensions are laser engraved for ease and clarity when reading.

Gauge set comes with a precision ground calibration block; each block has been surface ground to 0.0005 tolerance for exceptional accuracy.

$69.00
Please allow 4-6 days for delivery.

Appearance of carrying case may vary

Precision made from stainless steel. All markings and dimensions are laser engraved for ease and clarity when reading.

Gauge set comes with a precision ground calibration block; each block has been surface ground to 0.0005 tolerance for exceptional accuracy.

Weld Throat Depth

Set also includes one Mini Maglite^® AAA Flashlight (Lumens: 100) w/Pocket Clip, batteries and protective carry case. Hrt 2 live stream uzivo.

$86.00
Please allow 4-6 days for delivery.

For Delivery Outside the United States:

Theoretical Throat Of Fillet Weld

Check Fillet Leg & Throat Size

1 1/8' to 2' in 1/8' increments

$68.50
Please allow 4-6 days for delivery.

Check Fillet Leg & Throat Size

2 1/8' to 3' in 1/8' increments

$73.50
Please allow 4-6 days for delivery.

Appearance of carrying case may vary

Precision made from stainless steel. All markings and dimensions are laser engraved for ease and clarity when reading.

Gauge set comes with a precision ground calibration block; each block has been surface ground to 0.0005 tolerance for exceptional accuracy.

$69.00
Please allow 4-6 days for delivery.

Appearance of carrying case may vary

Precision made from stainless steel. All markings and dimensions are laser engraved for ease and clarity when reading.

Gauge set comes with a precision ground calibration block; each block has been surface ground to 0.0005 tolerance for exceptional accuracy.

Weld Throat Depth

Set also includes one Mini Maglite^® AAA Flashlight (Lumens: 100) w/Pocket Clip, batteries and protective carry case. Hrt 2 live stream uzivo.

$86.00
Please allow 4-6 days for delivery.

For Delivery Outside the United States:

If your order is to be delivered to a location outside the United States, we generally must add 10% to cover the additional Shipping & Handling charges. However, depending upon your items ordered and delivery location, this additional 10% might be too high or too low.

Please contact us with your list of desired items and delivery location so we may quote this adjusted total more accurately:

Section 5.3

Effective Areas and Size Limitations of Welds

Last Revised:11/04/2014

This section investigates the mechanics of load transfer between connected members by means of welds. We will look at this problem for each of the basic weld types. The strength of welds is determined by multiplying an effective area by the shear or tensile stress capacity of the weld material.

The effective area is generally determined by multiplying the length of the weld by and EFFECTIVE THROAT, t_e. The effective throat is a function of the WELD SIZE. The determination of effective throat size is a bit different for each type of weld.

The goal of the design process is to determine the required length and effective throat thickness for the connection being designed.

The specification requires a minimum effective throat thickness for most types of welds. The intent of the minimum effective throat thickness requirement is to ensure that the weld is of sufficient size to generate enough heat to form a good bond with the base metal. During the welding process, the base metal acts as a heat sink which draws heat away from the connection. If it draws the heat away too quickly, the poor bond is created between the base metal and weld metal.

The effective throat chosen for any weld design will be the LARGER of:

• the minimum requirement for ensuring a good bond with the base metal and
• the minimum required to develop the strength required to transfer the design forces.

Groove Welds

The effective area for the two main types of groove welds is shown in Figure 5.3.1 as specified in SCM specification section J2.1.

For CJP welds, the effective throat equals the thickness of the thinner part joined.

Weld Throat Size

For PJP welds, the effective throat equals the depth of the groove. There is a 1/8' reduction of the depth for the SMAW process if a 45^o bevel is used. (See SCM Table J2.1).

Table J2.3 gives minimum required effective throat to ensure a good bond for PJP welds.

Fillet Welds

The effective throat, t_e, for a fillet weld is taken as the least distance from the root of the weld (i.e. where the two connected pieces meet) to the outer surface of the weld as shown in Figure 5.3.2.

Figure 5.3.2
Fillet Weld Sectional Dimensions
Click on image for larger view

The effective area of your typical fillet weld equals the effective throat times the length of the weld as depicted in Figure 5.3.3. For clarity purposes, the figure shows the effective areas of two fillet welds, one on each side of the vertical piece.

Weld Throat Definition

Figure 5.3.3
Effective Area of Fillet Welds
Click on image for larger view

It is important to note that fillet welds are specified by their leg size, a, instead of by the effective throat, t_e. The vast majority of fillet welds are designed to have equal leg size, which makes t_e = a*sin(45^o) = 0.707a. If the leg sizes are not equal, you will need to determine t_e using trigonometry.

A change in the 13^th edition SCM is the elimination of an explicit allowance for an increase in t_e when using the SAW process. The prior editions of the specification allowed an increase in t_e for the SAW process because the process produced welds that had a consistent penetration beyond the root of the weld. The 13^th edition allows an unspecified increase based on test results that prove this condition. Since the increase is not explicitly stated, we will take the conservative approach of not taking an increase in t_e for the SAW process.

The specification places a number of limits on the size of fillet welds. These are found in SCM J2b.

The MINIMUM ALLOWED SIZE is specified in SCM section J2.2b, first paragraph which states that 'the minimum size of fillet welds shall not be less than the size required to transmit calculated forces, nor the size shown in Table J2.4' (Emphasis added!) The commentary on this section states that the 'requirements are not based on strength considerations, but on the quench effect of thick material on small welds.' (SCM pg 16.1-331) This means that the weld needs to be big enough to heat the base material sufficient to create a good bond between the base metal and the weld metal. Table J2.4 lists the minimum sized fillet welds. As you look at the table, you see that as the material thickness increases so does the minimum weld size.

Weld Throat Gauge

A MAXIMUM ALLOWED SIZE is also discussed in the specification. This particular requirement causes some confusion among first time users of the specification. This requirement is based on the AVAILABLE space for the weld. The limit applies only at the EDGES of plates. For example in Figure 5.3.4(A) the weld is not applied to an edge of either connected plate so the available space for the fillet weld is very large. In other words, t_pl is large on both legs of the weld. In Figure 5.3.4(B) one of the legs of the weld is along the edge of a plate so t_pl is limited.

Figure 5.3.4
Maximum Fillet Weld Size
Click on image for larger view

The specification limits the weld size, a, to being equal to t_pl if t_pl < 1/4' and to t_pl-1/16' if t_pl> 1/4', where t_pl is the minimum of the distances available for the fillet weld leg.

SCM specification J2.2 has a number of other limitations on fillet welds that you need to be familiar with as well. The rest are fairly self explanatory in the SCM so further coverage will not be made here.

As will be seen later, the strength of a welded connection is controlled by the weaker of the base metal or the weld (i.e. filler material). The strength of the base metal and the weld are based on their effective areas. Suffice it to say right now that as you increase fillet weld size, the weld strength may, at some point, exceed the strength of the base metal. Increasing the weld size any such that the weld strength exceeds the strength of the connected parts will be a waste of resources since it will not longer increase the strength of the connection.

The fillet weld size whose strength equals the base metal strength is called the largest effective fillet weld. It is, in essence, another practical limit on fillet weld size. This is discussed in more detail later.

Plug and Slot Welds

SCM specification J2.3a specifies the effective area of a plug or slot weld to equal 'the nominal cross-sectional area of the hole or slot in the plane of the faying surface.' These areas are depicted in Figure 5.3.4.

Weld Throat Images

Figure 5.3.4
Effective Area of Plug and Slot Welds
Click on image for larger view

There are limits on the minimum and maximum sizes of slot welds that can be found in the specification section J2.3b.