Tube Weld

     

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The tube weld template is one of the most flexible NAMeS templates.  However, this flexibility also makes it one of the more complicated models to use.  This template can be used for welds that look similar to these:

Figure 1  Example tube welds.

The template can measure a weld where one of the members being joined is a tube or hollow cylinder.  The other member is bent such that it has a circular section between two straight sections.  The resulting shape I will describe as an “A” shape.  Also, as is somewhat visible in the above images, the right plate can also begin to curve in the opposite direction.

Actually measuring the weld bead should be an easy task.  But first you will need to learn to position the plate lines.  Although it may seem difficult at first, positioning the plate lines will become much easier with a little practice.

To measure tube welds with the NAMeS software, the plates need to be oriented as shown in Figure 1 above, and Figure 2 below.  Notice that the tube/cylinder is located on the left side of the image with the “A” on the right.  If the weld is not oriented correctly, use the Flip buttons to change the captured image to this orientation.

After orienting the image correctly, be sure to remember to place the scale in the image.  NAMeS can not give you meaningful dimensions unless it has a scale set someplace.

Figure 2 Labels of all of the plate points.

The suggested method of measuring the plates of a tube weld is to first position the left plate, and then position the right plate.


Left Plate

To position the left plate, first place Left Plate 1 on the surface of the left plate just above the weld bead.  Then place Left Plate 3 on the surface of the left plate just below the weld bead.  Now as Left Plate 2 is moved right and left, it will become apparent when the circle lines up with the plate surface.  Place Left Plate Thickness so it matches the correct thickness.  Finally, readjust the first 3 points for the best fit possible.


Right Plate

Figure 3 The four regions of the right plate.  Each of these can be toggled on or off.

The right plate can be used to measure a variety of shaped plates.  To measure plates with different shapes, the weld input buttons in NAMeS are used.  These buttons are located (by default) on the right side of the image.  In the tube weld model, the relevant buttons are located just below “Scale Length”.  As Figure 4 shows, the check box just below “Scale Length” toggles between advanced and simple mode.  In advanced mode, each of the regions above can be Present or Not Present.  In simple mode, several common shapes are selected automatically as shown in Figure 5.

Figure 4 The weld input control is used to select the correct right plate shape.  Click on the lower check box to change between advanced and simple selection mode.

Figure 5 The various shapes selected when the simple mode check box is checked.


I recommend the advanced mode, where each section can be turned off and on individually; however, it is a matter of personal taste.  Whenever one of the right plate points is selected, you can do a right click and select “Reset Point Position” from the popup menu.  This will move the right points back to their default position.  Keep that mind when positioning the right plate and it goes crazy or flips upside down.

The right plate was designed such that it would be measured in the following way:

1.      Position the Bottom Circle if there is one.  The points “Pivot” and Straight End will attempt to not move the position of the bottom circle when they are moved. 

A.   First place “Pivot” right on the upper edge of the bottom circle.

B.  Then place Lower Curve 1 at a lower point on the curved surface of the circle

C.  Finally, move Lower Curve 2 around until the lower circle is outlined by the plate.  Lower Curve 1 and “Pivot” may need to be moved a bit also for best fit.


 

2.      Position the Middle Line and Top Circle if they are present. 

 

Bottom Circle Present

Move Straight End around until it lines up with the end of the straight section of the Middle Line.[A]  “Pivot” should already have been placed when placing the Bottom Curve.  Then just move Upper Curve to place both the Top Circle and the Right Line [B].  Finally, move the Thickness point to measure the plate thickness [C].  All of the points may need to be shifted around a bit for the best fit.


Bottom Circle Not Present

 

First move Straight End around until it lines up with the end of the straight section of the Middle Line [A].  Move the “Pivot” point around to change the angle of the middle line section so it best matches the actual Middle Line of the plate [B].  Then just move Upper Curve to place both the Top Circle and move the Thickness point to measure the plate thickness [C].  Notice that both Straight End and “Pivot” must be moved to change the tangent line of Middle Line without moving the Top Circle [D].

 


Weld Bead

Now both the left and right plates should be measured.  The hardest part is over.  Now switch to weld mode and move all the points to outline the weld.  The points can be moved individually in weld mode just like most other weld templates.  Also, by doing a right click, the option Quick Place Weld can be selected from the popup menu.

Figure 6 The general layout of the points is like this.  Notice that the Surface and Root points are not locked in this image.

The Weld Surface points should be evenly spaced along the weld surface. The L Surface Outer point and R Surface Outer point should go on the surface of the left and right plates respectively.  The Right Side points should be evenly spaced between the R Surface and R Root points.  The Left Side points should be evenly spaced between the L Surface and L Root points.  The position of each surface point and side point is not important, it is only important that the green outline follow the shape of the weld bead.

The one or three points in the gap, Gap 1, Gap 2, and Gap 3, should be placed at the back of the weld bead.  If the setting NN – Do Neural Network Calculations? Is set to “YES” then all three points will be evenly spaced between the plates.

Figure 7  [A] A weld with no penetration at the weld root.  [B] The weld can not be outlined accurately with a single point on the plate surface.  [C] Split the points by right clicking on them.  Then place one point where the penetration starts and one where the weld stops wetting the plate surface.

There are four (8) special points on the tubeweld template, these are: L Surface Outside, R Surface Outside, R Root Out., and L Root Out.  All of these points can be broken into two points by selecting them, and then right clicking on them.  Once you right click on them, the point will break into an Inner point and an Outer point.  To switch back to having only one point, do another right click when either the inner or outer point is selected.  These are used if there is no fusion at the toes of the weld, or at the root of the weld.  There is a small square drawn around the outside point when the inside and outside point are locked together.


Pore / Void

If the option Measure Elliptical Pore? is selected to “YES”, then there will be an option to add a pore or void into each image.   Then a button “No Pore Present” or “Measuring Pore” will be added.  Click on that button in order to toggle between whether the pore/void object is present to measure a void.  Set the height and width of the pore using the Void Height and Void Width points.  Rotate it to any desired angle with Tilt Angle.  Finally, the Void Center can be moved to move the entire ellipse around until it matches the void.

  

Figure 8  A pore/void or void can be measured by this object.


Settings:

Measure Elliptical Pore?

Set this to yes if you may want to measure the size of a single void or pore in the weld.  The void object is measured in plate mode, and it is just an ellipse that can be rotated and sized to best outline the imperfection. 

Use five-point side outlines?

It is recommended that you say YES here.  Saying NO will only give you three points on each edge of the weld to outline the plates.  Five points is usually more descriptive, and the extra work to place the new points is minimal.

 

Use three-point gap outline?

The information from the gap is not usually very important.  Saying NO here will cause only a single point to be placed in the gap.  Since you will still have the R Root Out. and L Root Out. points to help outline any weld bead in the gap region, a single point is probably sufficient.  Choosing YES will add two points, and is recommended if you are interested in more detail or do not mind the bother of more points.

 

Use simple settings for the right plate?

This setting is no longer used.  When it was set to YES, the right plate shape could only be set using the single toggle button as described in the section on measuring the right plate.

 

NN – Do Neural Network Calculations?

In general, NO is okay here.  When this is set to YES, special calculations will be done to help ensure valid measurements for a neural network training file.  The gap points will become constrained between the left and right plates.  Also, two construction lines can be added using the third green line-toggle button (the fourth button – “Weld Lines #3”).  The construction lines are used as a base point for the neural network values.

 

 

Dimensions:

 

Dimension help can be viewed at http://www.natech-inc.com/names/help.