SDC Verifier

Weld Finder

Weld finder finder is a tool that performs search of welds on a model. Weld consists of weld parts. Each weld part is a set of elements from one side of welded connection. Weld part can be welded or non-welded and has its own properties: weld length, weld type, throat thickness etc.

Weld finder tool is used for fatigue and weld strength calculations to orient stresses in weld coordinate system.

To add Weld Finder execute Recognition - Weld Finder from the main menu. Alternatively, use Weld Finder context menu.

Welds Recognition:

By default, All Entities are selected in Searching - Selection. Set custom selection if it is necessary to perform the search only on a part of the model.

Not welded properties - connection places between the properties where a weld will be ignored during the recognition. For example, beam is modeled with plates:

Add multiple:

Select Property 1 from the drop down list and the required items for the Property 2 and press Add. All combinations of Property 1 and Property 2 will be created.

Add by IDs:

- pick property ID by the selected element from Femap.

Press Add to add the property to the list.

Note: The existing combinations will be skipped. Combinations of the same property ids will be taken into account during the recognition.

- preview only selected combinations;

- highlight selected combinations;

- remove selected combinations;

Each Weld Title = Weld + ID + (weld center coordinate).

Action to current welds - option that helps to manipulate with existing welds:

- Remove all - remove all existing welds before recognition. Warning message will appear if at least one weld exists:

- Keep only modified - keep all welds where any parameter was modified (e.g. throat thickness, welded/non welded parts etc.). The elements from this welds will be skipped during the recognition;

- Keep all existing - keep all previously recognized welds. Elements from this welds will be skipped during the recognition.

Check on Free Edges before search - perform the search on free edges and displays the message, if free edges were found:

Treat as weld if different property IDs - in case two properties are of equal thicknesses, weld will be created if the option is ON.

Treat neighbor weld elements as one weld if Angle < value - the angle that determines the straightness of the weld. In the example real angle = 63.44 and a set value of 20 degrees will provide 6 welds. If the set value is equal to 70 degrees - 1 weld is recognized.

Treat elements of the same property as weld if angle A > set value - if two elements of the same property form the angle that is more than the defined, these two elements will form a weld.

Set full weld welded if different property IDs - if all weld parts of a weld connection are formed by different properties they will be automatically set as welded.

Press to perform search. During the search progress with a count of checked elements will be displayed:

After the recognition is finished, all welds are checked on the design. The list of welds that are recommended to be checked manually will be displayed:

Note: This method is equal if to press Check on weld design button in weld finder window.

Note: if weld consists of only 2 parts (e.g. Angle-weld), all parts will be set as welded but weld will not be included to the list.

- edit selected weld;

- remove selected welds;

- highlight selected welds (highlight weld elements on entire model);

- preview selected welds (only selected elements will be displayed);

- plot welded/non-welded parts of selected welds in colors;

- plot selected weld Ids.

- plot welds in colors and put labels of lengths for each weld parts.

- plot welded/non-welded parts of selected welds. Pick elements from necessary weld parts to set full weld part welded.

- plot welded/non-welded parts of selected welds. Pick elements from necessary weld parts to set full weld part non-welded.

Note: Only one element from respective weld part can be selected.

After weld design is checked, full list of recognized welds is displayed:

- add custom weld;

- edit selected weld;

- combine selected welds into one and add to the end of the list.

Note:Welds should be connected. Error message will be displayed otherwise:

- split selected welds at selected nodes and add new welds to the end of the list.

Note: At least one selected node should belong to selected welds. The error message will be displayed otherwise:

- remove selected welds.

- highlight selected welds (highlight weld elements on entire model);

- preview selected welds (only selected elements will be displayed);

- plot welded/non-welded parts of selected welds in colors;

- plot weld part numbers of selected welds in different colors;

To plot selected welds press:

- plot weld colors only;

- plot weld colors and the labels with Ids;

- plot weld colors and the labels with lengths of weld parts;

- plot weld colors and the labels with throat thicknesses of weld parts;

Example of plot with labels of Ids

Use and to change the welds order.

Press to highlight welds in the list that contain selected element from the model;

Press to plot weld part numbers and coordinate systems of each weld part of selected welds:

Add/Edit Weld

Weld Nodes - nodes that define a welding line. Select nodes using Entity Rule Selector.

Weld Elements - elements that are connected to the weld nodes. By default they are recognized automatically but sometimes element does not fit the required recognition settings (e.g. element is under bigger angle that defined in settings). In this case it is possible to modify elements manually. Enabled when the pick elements manually option is turned ON.

Pick elements manually - weld elements are defined by a user. Automatic recognition of elements is not performed.

Note: All weld nodes should belong to weld elements.

Note: The option is automatically disabled when weld is in Add mode and enabled when in Edit mode.

- recognize weld elements from nodes. Enabled when the Pick elements manually option is turned ON;

Analyze weld - performs recognition of weld parts and their properties (welded/non-welded, length, origin and coordinate system.

Note: A part is welded if:

- It does not form a plane with any other part and any other parts form a single plane (e.g. T-weld);

- It is the thinnest part of the weld. If all thicknesses are equal, all weld parts are non-welded;

Preview weld - highlight weld elements on entire model;

Apply to selected weld parts - modifies a weld type, length, coordinate system and origin of the selected weld parts.

Coordinate System can be defined by the rotational angles around global X, Y and Z axes or by defining coordinate system vectors manually:

Result rotation angles - angles that will define coordinate system.

If directions of axes are not perpendicular between each other, the result rotation angles will display the following message:

Origin can be set manually or picked from the model:

Apply for selected weld parts (only for welded parts) - apply a weld type and dimensions to welded parts.

Weld type - define type of welding for a single weld part. None type is set by default.

Dimensions of weld part defines welding size. For different weld types dimensions can be set in different way:

- Double full penetration - all dimensions are calculated using weld part thickness as shown on the picture below:

Double partial penetration - weld leg horizontal (r), weld leg vertical (h) and penetration depth (s) are input parameters. Alpha and throat thickness (a) are calculated automatically:

Double fillet - alpha is automatically set to 45°. If weld leg horizontal (r) = weld leg vertical (h) are inputs - throat thickness (a) is calculated automatically and vice versa.

If aply by throat thickness is selected, it is possible to set custom throat thickness (a) or use a half of weld part thickness (t).

Override type - apply new thickness by options:

- All - set to all selected parts;

- New 'a' is less - apply only to parts where new thickness is less than in existing part;

- New 'a' is higher - apply only to parts where new thickness is higher than in existing part;

Welds Details

It is possible to filter welds by criteria:

All welds on selection - select part of the model where a filter will be applied.

Welds Filter

Show all - show all welds on a filter selection;

Curved only - show only curved welds. A weld is curved if any angle of the weld exceeds 3°;

Weld Type - show welds if any weld part is of the selected weld type;

Length, t, r, s, h, Alpha, a - show welds if any weld part dimension matches the criteria (<, >, between the set values etc.)

Welds with all parts welded/non-welded - filter the welds that contains all parts welded or non-welded;

Asymmetric welds - the welds with weld parts that are not perpendicular to each other (5 degree tolerance);

Welds with linear parts - the welds that contain beam/bar elements;

Weld Parts Filter

.

All - display both welded and non-welded parts;

Welded only - display only welded parts in the list;

Non-welded only - display only non-welded parts in the list;

Press Apply filter to display weld parts by selected criteria;

Apply to selected weld parts - apply length, thickness, coordinate system and origin to all selected weld parts.

Apply dimensions to selected weld parts - apply dimensions to weld parts of selected type. Detailed explanation can be found in Add/Edit Weld.

- plot weld types of related weld parts of selected welds;

Note: Other plotting and preview options are described above in the Welds Recognition.

- restore original length, weld part thickness and weld sizes of all selected weld parts. Weld type in this case will be set to None.

-open window to export selected weld parts and related welds:

By default, selected weld parts and single component options are selected.

Export welds (count) - all welds that contain selected weld parts;

Export weld parts (count) - all selected weld parts;

Single component title - set title of component if the Single component option is ON;

Single group title - set title of group if the Single group option is ON;

Export types are applied separately to welds or weld parts options:

- Single component - create one component from the elements of selected welds or weld parts;

- Single group - create one group from elements of selected welds or weld parts;

- Separate components - create separate components for each selected weld or weld part;

- Separate groups - create separate group for each selected weld or weld part;

Press Export to create all selected components and groups;

- preview all asymmetric welds found from all recognized by weld finder.

Weld Stresses

To perform a weld strength or fatigue checks on welds the calculated stresses should be oriented into the weld direction:

X - parallel the weld.

Y - perpendicular to the weld.

Weld Stresses are, therefore, implemented as a separate category of result. All the tables/plots for stresses also can be created for the weld stresses.

Conversion of stresses is performed automatically without reorientation of elements. So no rerun of the analysis is needed.

Note: The conversion is applied only for X, Y and XY direction. The Equivalent direction is calculated using converted X, Y and XY directions.

Note: Weld X direction for elements that are connected to the weld only at 1 node will be calculated using the connected node and a default neighbor weld node.

Note: If welds were not recognized, the original stresses will be used and the warning message will be shown:

Note: For the elements that do not belong to any weld, the original stress will be used.

It is possible to use the weld stresses for the checks by using the Sweld variable in the formula editor. For example, the different allowable stresses for shear stress and normal stresses parallel and perpendicular to the weld orientation can then easily be accounted for: