Select Mesh
Edit from the main menu bar to merge nodes. If you select only two nodes to merge, ABAQUS/CAE creates a new node at the midpoint of the selected nodes. If you select more than two nodes, you can specify the maximum distance between nodes, and ABAQUS/CAE will merge nodes that are closer than the specified distance. You can also choose to remove duplicate elements that have the same connectivity.
To merge nodes:
Enter the Mesh module.
From the Object field in the context bar, select Part and select an orphan mesh part from the list of parts. This tool is available only for working on an orphan mesh part.
From the main menu bar, select MeshEdit.
ABAQUS/CAE displays the Edit Mesh dialog box.
Tip:
You can also display the Edit Mesh dialog box using the 
tool, located at the bottom of the Mesh module toolbox.
In the dialog box, do the following:
In the Category field, select Node.
From the Method list, select Merge.
Click OK.
Use one of the following methods to select the nodes that you want to merge:
Selecting individual nodes
From the menu in the prompt area, select individually.
Select a node that you want to merge, or drag-select a group of nodes.
[Shift]+Click on additional nodes to add them to your selection.
If necessary, [Ctrl]+Click on selected nodes to remove them from your selection.
When you have finished selecting nodes, click mouse button 2. For more information, see “Selecting objects within the current viewport,” Section 6.2.
Selecting nodes using the angle method
From the text field in the prompt area, select by angle.
Enter an angle (from 0° to 90°), and select a node. ABAQUS/CAE selects every node on element faces adjacent to the selected node until the angle between the element faces is equal to or exceeds the angle that you entered. (See “Using the angle method to select multiple objects,” Section 6.2.3, for more information.)
After you use the by angle method, you can [Shift]+Click on additional nodes to add them to your selection or [Ctrl]+Click on selected nodes to remove them from your selection. (See “Combining selection techniques,” Section 6.2.4, for more information.)
When you have finished selecting nodes, click mouse button 2.
Specifying an existing node set
Click Sets on the right side of the prompt area. ABAQUS/CAE displays the Region Selection dialog box containing a list of node sets that you have created.
Select the set of nodes that you want to merge, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
Tip:
You can change the picking behavior by clicking the selection options tool 
in the prompt area. For more information, see Chapter 6, “Selecting objects within the viewport.”
If you selected only two nodes to merge, ABAQUS/CAE creates a new node at the midpoint of the selected nodes.
If you selected more than two nodes to merge, do the following:
In the prompt area, enter the Node merging tolerance to specify the maximum distance between nodes that you want to merge.
If the value that you entered for the Node merging tolerance is too large, ABAQUS/CAE may detect duplicate nodes from the same element. ABAQUS/CAE will not merge nodes from the same element, but the large tolerance can result in a distorted mesh. If the Node merging tolerance is too large, ABAQUS/CAE asks if you want to continue merging the selected nodes.
Click Yes to continue.
Click No to cancel the merging procedure.
ABAQUS/CAE highlights in magenta any nodes that will be merged and asks if you wish to proceed.
Click Yes to continue.
Click No to cancel the merging procedure.
ABAQUS/CAE merges the nodes that are closer than the specified distance and replaces them with a single new node. The location of the new node is the average position of the group of nodes that were merged into the new node. You can also merge orphan mesh part instances in the Assembly module. For more information, see “Merging and cutting part instances,” Section 13.6.
If you previously created node or element sets that include nodes or elements that are deleted by the merge operation, ABAQUS/CAE updates your sets accordingly.
Tip: If you make a mistake while merging nodes, click Undo in the Edit Mesh dialog box to undo the merge. ABAQUS/CAE restores the nodes as they were before the merge.
Repeat the above steps as often as necessary to merge additional nodes.
When you have finished merging nodes, click mouse button 2 or the cancel button 
in the prompt area to exit the procedure.
